I'm also gonna link the ai03 tutorial I used to design/build my own custom board. Text based, multiple pages: https://wiki.ai03.com/books/pcb-design/page/pcb-g

I'm also gonna link the ai03 tutorial I used to design/build my own custom board. Text based, multiple pages: https://wiki.ai03.com/books/pcb-design/page/pcb-guide-part-1---preparations https://wiki.ai03.com/books/pcb-design/page/pcb-guide-part-1... Once you build your first little macropad, and verify that your design is generally correct, you can fork the repo you created and pretty much copy/paste your MCU region, and build a new grid of keys around it. The guide also gave me good tips on what to have assembled, and what to hand-solder, to be able to cut some costs.