I’m really happy to help you with any question. Start with the following:

1. create your own layout in KLE, it is simple and fun: http://www.keyboard-layout-editor.com/
2. Generate the backplate from the KLE output http://builder.swillkb.com/
3. Load the backplate dxf into your cad file of choice and start experimenting with a case around it.

for lasering the keycaps look on this guide: https://youtu.be/JR1BwcFyexQ for wiring kbfirmware can generate you the wiring https://kbfirmware.com/

My 10 years old volvo does not have a spare only some spray can repair kit. However it has all the tools to change a tire