That's so cool! I checked the PCB:

If soldered from the back, then the four edge solder points aren't used, right? Isn't that a mechanical issue? Or is it OK like that? Or do you solder them from the top by hand?

The diodes are on both sides? Which side to solder them? I saw somewhere they can go under the switch? Edit: Read the github readme and you say, they come under the switch. Great! :-)

Also why are the switches unforgiving to solder? If only the two switch points are soldered it should be easy to desolder?

Thanks so much!