diff --git a/.circleci/config.yml b/.circleci/config.yml
index 277d605..9a655cc 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -37,6 +37,7 @@ jobs:
             - v1-kmk-venv-{{ checksum "Pipfile.lock" }}
 
       - run: pip install pipenv==2018.7.1
+      - run: apt-get update && apt-get install -y gcc-arm-none-eabi gettext wget unzip rsync
       - run: make test
 
   build_pyboard:
@@ -54,7 +55,7 @@ jobs:
             - v1-kmk-venv-{{ checksum "Pipfile.lock" }}
 
       - run: pip install pipenv==2018.7.1
-      - run: apt-get update && apt-get install -y gcc-arm-none-eabi gettext wget unzip
+      - run: apt-get update && apt-get install -y gcc-arm-none-eabi gettext wget unzip rsync
 
       - run: make SKIP_KEYMAP_VALIDATION=1 USER_KEYMAP=user_keymaps/noop.py build-pyboard
 
@@ -73,7 +74,7 @@ jobs:
             - v1-kmk-venv-{{ checksum "Pipfile.lock" }}
 
       - run: pip install pipenv==2018.7.1
-      - run: apt-get update && apt-get install -y gcc-arm-none-eabi gettext wget unzip
+      - run: apt-get update && apt-get install -y gcc-arm-none-eabi gettext wget unzip rsync
 
       - run: make USER_KEYMAP=user_keymaps/noop.py build-teensy-3.1
 
diff --git a/Makefile b/Makefile
index f5c7f6d..4e6df27 100644
--- a/Makefile
+++ b/Makefile
@@ -3,22 +3,30 @@
 	circuitpy-deps \
 	circuitpy-freeze-kmk-nrf \
 	devdeps \
-	freeze-nrf-vendor-deps \
+	freeze-nrf-build-deps \
 	lint
 
 AMPY_PORT ?= /dev/ttyUSB0
 AMPY_BAUD ?= 115200
 AMPY_DELAY ?= 1.5
 ARDUINO ?= /usr/share/arduino
+PIPENV ?= $(shell which pipenv)
 
 devdeps: Pipfile.lock
-	@pipenv install --dev --ignore-pipfile
+	@$(PIPENV) install --dev --ignore-pipfile
 
 lint: devdeps
-	@pipenv run flake8
+	@$(PIPENV) run flake8
 
 fix-isort: devdeps
-	@find kmk/ user_keymaps/ -name "*.py" | xargs pipenv run isort
+	@find kmk/ user_keymaps/ -name "*.py" | xargs $(PIPENV) run isort
+
+clean:
+	rm -rf .submodules .circuitpy-deps .micropython-deps build
+
+powerwash: clean
+	rm -rf vendor
+	$(PIPENV) --rm
 
 test: micropython-build-unix
 	@echo "===> Testing keymap_sanity_check.py script"
@@ -32,102 +40,103 @@ test: micropython-build-unix
 	@MICROPYPATH=tests/test_data:./ ./bin/micropython.sh bin/keymap_sanity_check.py keymaps/duplicate_row_pins.py 2>/dev/null && exit 1 || exit 0
 	@echo "===> The sanity checker is sane, unlike klardotsh"
 
-.submodules: .gitmodules
+.submodules: .gitmodules submodules.toml
 	@echo "===> Pulling dependencies, this may take several minutes"
 	@git submodule update --init --recursive
+	@rsync -avh vendor/ build/
 	@touch .submodules
 
 .circuitpy-deps: .submodules
 	@echo "===> Building circuitpython/mpy-cross"
-	@make -C vendor/circuitpython/mpy-cross
+	@make -C build/circuitpython/mpy-cross
 	@echo "===> Pulling Nordic BLE stack"
-	@cd vendor/circuitpython/ports/nrf && ./drivers/bluetooth/download_ble_stack.sh 2>/dev/null >/dev/null
+	@cd build/circuitpython/ports/nrf && ./drivers/bluetooth/download_ble_stack.sh 2>/dev/null >/dev/null
 	@touch .circuitpy-deps
 
 .micropython-deps: .submodules
 	@echo "===> Building micropython/mpy-cross"
-	@make -C vendor/micropython/mpy-cross
+	@make -C build/micropython/mpy-cross
 	@touch .micropython-deps
 
+submodules: .submodules
 circuitpy-deps: .circuitpy-deps
-
 micropython-deps: .micropython-deps
 
-vendor/micropython/ports/unix/micropython: micropython-deps vendor/micropython/ports/unix/modules/.kmk_frozen
-	@make -j4 -C vendor/micropython/ports/unix
+build/micropython/ports/unix/micropython: micropython-deps build/micropython/ports/unix/modules/.kmk_frozen
+	@make -j4 -C build/micropython/ports/unix
 
-micropython-build-unix: vendor/micropython/ports/unix/micropython
+micropython-build-unix: build/micropython/ports/unix/micropython
 
-freeze-nrf-vendor-deps: vendor/circuitpython/ports/nrf/freeze/.kmk_frozen
-freeze-teensy3.1-vendor-deps: vendor/micropython/ports/teensy/freeze/.kmk_frozen
-freeze-stm32-vendor-deps: vendor/micropython/ports/stm32/freeze/.kmk_frozen
+freeze-nrf-build-deps: build/circuitpython/ports/nrf/freeze/.kmk_frozen
+freeze-teensy3.1-build-deps: build/micropython/ports/teensy/freeze/.kmk_frozen
+freeze-stm32-build-deps: build/micropython/ports/stm32/freeze/.kmk_frozen
 
-vendor/micropython/ports/unix/modules/.kmk_frozen: upy-freeze.txt
-	@echo "===> Preparing vendored dependencies for local development"
-	@rm -rf vendor/micropython/ports/unix/freeze/*
-	@cat $< | xargs -I '{}' cp -a {} vendor/micropython/ports/unix/modules/
+build/micropython/ports/unix/modules/.kmk_frozen: upy-freeze.txt
+	@echo "===> Preparing builded dependencies for local development"
+	@rm -rf build/micropython/ports/unix/freeze/*
+	@cat $< | xargs -I '{}' cp -a {} build/micropython/ports/unix/modules/
 	@touch $@
 
-vendor/circuitpython/ports/nrf/freeze/.kmk_frozen: upy-freeze.txt
-	@echo "===> Preparing vendored dependencies for bundling"
-	@rm -rf vendor/circuitpython/ports/nrf/freeze/*
-	@cat $< | xargs -I '{}' cp -a {} vendor/circuitpython/ports/nrf/freeze/
+build/circuitpython/ports/nrf/freeze/.kmk_frozen: upy-freeze.txt
+	@echo "===> Preparing builded dependencies for bundling"
+	@rm -rf build/circuitpython/ports/nrf/freeze/*
+	@cat $< | xargs -I '{}' cp -a {} build/circuitpython/ports/nrf/freeze/
 	@touch $@
 
-vendor/micropython/ports/teensy/freeze/.kmk_frozen: upy-freeze.txt
-	@echo "===> Preparing vendored dependencies for bundling"
-	@mkdir -p vendor/micropython/ports/teensy/freeze/
-	@rm -rf vendor/micropython/ports/teensy/freeze/*
-	@cat $< | xargs -I '{}' cp -a {} vendor/micropython/ports/teensy/freeze/
+build/micropython/ports/teensy/freeze/.kmk_frozen: upy-freeze.txt
+	@echo "===> Preparing builded dependencies for bundling"
+	@mkdir -p build/micropython/ports/teensy/freeze/
+	@rm -rf build/micropython/ports/teensy/freeze/*
+	@cat $< | xargs -I '{}' cp -a {} build/micropython/ports/teensy/freeze/
 	@touch $@
 
-vendor/micropython/ports/stm32/freeze/.kmk_frozen: upy-freeze.txt
-	@echo "===> Preparing vendored dependencies for bundling"
-	@mkdir -p vendor/micropython/ports/stm32/freeze/
-	@rm -rf vendor/micropython/ports/stm32/freeze/*
-	@cat $< | xargs -I '{}' cp -a {} vendor/micropython/ports/stm32/freeze/
+build/micropython/ports/stm32/freeze/.kmk_frozen: upy-freeze.txt
+	@echo "===> Preparing builded dependencies for bundling"
+	@mkdir -p build/micropython/ports/stm32/freeze/
+	@rm -rf build/micropython/ports/stm32/freeze/*
+	@cat $< | xargs -I '{}' cp -a {} build/micropython/ports/stm32/freeze/
 	@touch $@
 
-circuitpy-freeze-kmk-nrf: freeze-nrf-vendor-deps
+circuitpy-freeze-kmk-nrf: freeze-nrf-build-deps
 	@echo "===> Preparing KMK source for bundling into CircuitPython"
-	@rm -rf vendor/circuitpython/ports/nrf/kmk*
-	@cp -av kmk vendor/circuitpython/ports/nrf/freeze/
+	@rm -rf build/circuitpython/ports/nrf/kmk*
+	@cp -av kmk build/circuitpython/ports/nrf/freeze/
 
-micropython-freeze-kmk-teensy3.1: freeze-teensy3.1-vendor-deps
+micropython-freeze-kmk-teensy3.1: freeze-teensy3.1-build-deps
 	@echo "===> Preparing KMK source for bundling into MicroPython"
-	@rm -rf vendor/micropython/ports/teensy/kmk*
-	@cp -av kmk vendor/micropython/ports/teensy/memzip_files/
+	@rm -rf build/micropython/ports/teensy/kmk*
+	@cp -av kmk build/micropython/ports/teensy/memzip_files/
 
-micropython-freeze-kmk-stm32: freeze-stm32-vendor-deps
+micropython-freeze-kmk-stm32: freeze-stm32-build-deps
 	@echo "===> Preparing KMK source for bundling into MicroPython"
-	@rm -rf vendor/micropython/ports/stm32/freeze/kmk*
-	@cp -av kmk vendor/micropython/ports/stm32/freeze/
+	@rm -rf build/micropython/ports/stm32/freeze/kmk*
+	@cp -av kmk build/micropython/ports/stm32/freeze/
 
 circuitpy-build-nrf:
 	@echo "===> Building CircuitPython"
-	@make -C vendor/circuitpython/ports/nrf BOARD=feather_nrf52832 SERIAL=${AMPY_PORT} SD=s132 FROZEN_MPY_DIR=freeze clean all
+	@make -C build/circuitpython/ports/nrf BOARD=feather_nrf52832 SERIAL=${AMPY_PORT} SD=s132 FROZEN_MPY_DIR=freeze clean all
 
 circuitpy-flash-nrf: circuitpy-build-nrf
 	@echo "===> Flashing CircuitPython with KMK and your keymap"
-	@make -C vendor/circuitpython/ports/nrf BOARD=feather_nrf52832 SERIAL=${AMPY_PORT} SD=s132 FROZEN_MPY_DIR=freeze dfu-gen dfu-flash
+	@make -C build/circuitpython/ports/nrf BOARD=feather_nrf52832 SERIAL=${AMPY_PORT} SD=s132 FROZEN_MPY_DIR=freeze dfu-gen dfu-flash
 
 micropython-build-teensy3.1:
-	@make -C vendor/micropython/ports/teensy/ BOARD=TEENSY_3.1 all
+	@make -C build/micropython/ports/teensy/ BOARD=TEENSY_3.1 all
 
 micropython-flash-teensy3.1: micropython-build-teensy3.1
-	@make -C vendor/micropython/ports/teensy/ BOARD=TEENSY_3.1 deploy
+	@make -C build/micropython/ports/teensy/ BOARD=TEENSY_3.1 deploy
 
 micropython-build-pyboard:
-	@make -j4 -C vendor/micropython/ports/stm32/ BOARD=PYBV11 FROZEN_MPY_DIR=freeze all
+	@make -j4 -C build/micropython/ports/stm32/ BOARD=PYBV11 FROZEN_MPY_DIR=freeze all
 
 micropython-flash-pyboard: micropython-build-pyboard
-	@make -j4 -C vendor/micropython/ports/stm32/ BOARD=PYBV11 FROZEN_MPY_DIR=freeze deploy
+	@make -j4 -C build/micropython/ports/stm32/ BOARD=PYBV11 FROZEN_MPY_DIR=freeze deploy
 
 circuitpy-flash-nrf-entrypoint:
 	@echo "===> Flashing entrypoint if it doesn't already exist"
 	@sleep 2
-	@-timeout -k 5s 10s pipenv run ampy -p ${AMPY_PORT} -d ${AMPY_DELAY} -b ${AMPY_BAUD} rm main.py 2>/dev/null
-	@-timeout -k 5s 10s pipenv run ampy -p ${AMPY_PORT} -d ${AMPY_DELAY} -b ${AMPY_BAUD} put entrypoints/feather_nrf52832.py main.py
+	@-timeout -k 5s 10s $(PIPENV) run ampy -p ${AMPY_PORT} -d ${AMPY_DELAY} -b ${AMPY_BAUD} rm main.py 2>/dev/null
+	@-timeout -k 5s 10s $(PIPENV) run ampy -p ${AMPY_PORT} -d ${AMPY_DELAY} -b ${AMPY_BAUD} put entrypoints/feather_nrf52832.py main.py
 	@echo "===> Flashed keyboard successfully!"
 
 ifndef USER_KEYMAP
@@ -139,12 +148,12 @@ flash-feather-nrf52832:
 else
 build-feather-nrf52832: lint devdeps circuitpy-deps circuitpy-freeze-kmk-nrf
 	@echo "===> Preparing keyboard script for bundling into CircuitPython"
-	@cp -av ${USER_KEYMAP} vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+	@cp -av ${USER_KEYMAP} build/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
 	@$(MAKE) circuitpy-build-nrf
 
 flash-feather-nrf52832: lint devdeps circuitpy-deps circuitpy-freeze-kmk-nrf
 	@echo "===> Preparing keyboard script for bundling into CircuitPython"
-	@cp -av ${USER_KEYMAP} vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+	@cp -av ${USER_KEYMAP} build/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
 	@$(MAKE) circuitpy-flash-nrf circuitpy-flash-nrf-entrypoint
 endif
 
@@ -157,12 +166,12 @@ flash-teensy-3.1:
 else
 build-teensy-3.1: lint devdeps micropython-deps micropython-freeze-kmk-teensy3.1
 	@echo "===> Preparing keyboard script for bundling into MicroPython"
-	@cp -av ${USER_KEYMAP} vendor/micropython/ports/teensy/freeze/kmk_keyboard_user.py
+	@cp -av ${USER_KEYMAP} build/micropython/ports/teensy/freeze/kmk_keyboard_user.py
 	@$(MAKE) ARDUINO=${ARDUINO} micropython-build-teensy3.1
 
 flash-teensy-3.1: lint devdeps micropython-deps micropython-freeze-kmk-teensy3.1
 	@echo "===> Preparing keyboard script for bundling into MicroPython"
-	@cp -av ${USER_KEYMAP} vendor/micropython/ports/teensy/freeze/kmk_keyboard_user.py
+	@cp -av ${USER_KEYMAP} build/micropython/ports/teensy/freeze/kmk_keyboard_user.py
 	@$(MAKE) ARDUINO=${ARDUINO} micropython-flash-teensy3.1
 endif
 
@@ -182,22 +191,22 @@ endif
 ifndef SKIP_KEYMAP_VALIDATION
 	@MICROPYPATH=./ ./bin/micropython.sh bin/keymap_sanity_check.py ${USER_KEYMAP}
 endif
-	@cp -av ${USER_KEYMAP} vendor/micropython/ports/stm32/freeze/kmk_keyboard_user.py
+	@cp -av ${USER_KEYMAP} build/micropython/ports/stm32/freeze/kmk_keyboard_user.py
 	@$(MAKE) AMPY_PORT=/dev/ttyACM0 AMPY_BAUD=115200 micropython-build-pyboard
 
 flash-pyboard: lint devdeps micropython-deps micropython-freeze-kmk-stm32
 	@echo "===> Preparing keyboard script for bundling into MicroPython"
-	@cp -av ${USER_KEYMAP} vendor/micropython/ports/stm32/freeze/kmk_keyboard_user.py
-	@cp -av kmk/entrypoints/global.py vendor/micropython/ports/stm32/freeze/_main.py
-	@cp -av kmk/entrypoints/handwire/pyboard_boot.py vendor/micropython/ports/stm32/freeze/_boot.py
+	@cp -av ${USER_KEYMAP} build/micropython/ports/stm32/freeze/kmk_keyboard_user.py
+	@cp -av kmk/entrypoints/global.py build/micropython/ports/stm32/freeze/_main.py
+	@cp -av kmk/entrypoints/handwire/pyboard_boot.py build/micropython/ports/stm32/freeze/_boot.py
 	@$(MAKE) micropython-flash-pyboard
 endif
 
 reset-bootloader:
-	@-timeout -k 5s 10s pipenv run ampy -p /dev/ttyACM0 -d ${AMPY_DELAY} -b ${AMPY_BAUD} run util/bootloader.py
+	@-timeout -k 5s 10s $(PIPENV) run ampy -p /dev/ttyACM0 -d ${AMPY_DELAY} -b ${AMPY_BAUD} run util/bootloader.py
 
 reset-board:
-	@-timeout -k 5s 10s pipenv run ampy -p /dev/ttyACM0 -d ${AMPY_DELAY} -b ${AMPY_BAUD} run util/reset.py
+	@-timeout -k 5s 10s $(PIPENV) run ampy -p /dev/ttyACM0 -d ${AMPY_DELAY} -b ${AMPY_BAUD} run util/reset.py
 
 # Fully wipe the board with only stock CircuitPython
 burn-it-all-with-fire: lint devdeps
@@ -207,14 +216,14 @@ burn-it-all-with-fire: lint devdeps
 	@echo "===> Pulling dependencies, this may take several minutes"
 	@git submodule update --init --recursive
 	@echo "===> Building circuitpython/mpy-cross"
-	@make -C vendor/circuitpython/mpy-cross
+	@make -C build/circuitpython/mpy-cross
 	@echo "===> Pulling Nordic BLE stack"
-	@cd vendor/circuitpython/ports/nrf && ./drivers/bluetooth/download_ble_stack.sh 2>/dev/null >/dev/null
+	@cd build/circuitpython/ports/nrf && ./drivers/bluetooth/download_ble_stack.sh 2>/dev/null >/dev/null
 	@echo "===> Preparing KMK source for bundling into CircuitPython"
-	@rm -rf vendor/circuitpython/ports/nrf/*
+	@rm -rf build/circuitpython/ports/nrf/*
 	@echo "===> Building CircuitPython WITHOUT KMK or user keyboard script to induce ImportError"
 	@$(MAKE) circuitpy-flash-nrf
 	@echo "===> Wiping keyboard config"
 	@sleep 2
-	@-timeout -k 5s 10s pipenv run ampy -p ${AMPY_PORT} -d ${AMPY_DELAY} -b ${AMPY_BAUD} rm main.py 2>/dev/null
+	@-timeout -k 5s 10s $(PIPENV) run ampy -p ${AMPY_PORT} -d ${AMPY_DELAY} -b ${AMPY_BAUD} rm main.py 2>/dev/null
 	@echo "===> Wiped! Probably safe to flash keyboard, try Python serial REPL to verify?"
diff --git a/bin/micropython.sh b/bin/micropython.sh
index 3854508..154dd23 100755
--- a/bin/micropython.sh
+++ b/bin/micropython.sh
@@ -1,6 +1,6 @@
-if [ ! -f vendor/micropython/ports/unix/micropython ]; then
+if [ ! -f build/micropython/ports/unix/micropython ]; then
 	echo "Run make micropython-build-unix"
 	exit 1
 fi
 
-vendor/micropython/ports/unix/micropython $@
+build/micropython/ports/unix/micropython $@
diff --git a/setup.cfg b/setup.cfg
index b262f02..e4505e2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [flake8]
-exclude = .git,__pycache__,vendor,.venv
+exclude = .git,__pycache__,vendor,.venv,build
 max_line_length = 99
 ignore = X100, E262
 per-file-ignores =
diff --git a/submodules.toml b/submodules.toml
new file mode 100644
index 0000000..d55a883
--- /dev/null
+++ b/submodules.toml
@@ -0,0 +1,4 @@
+[submodules]
+"vendor/circuitpython" = "d751740"
+"vendor/micropython" = "65a49fa"
+"vendor/upy-lib" = "f20d89c"