As a software developer, I'm pretty lost when it comes to circuits, soldering, etc. I can mix and match parts for my PC and not fuck up, but building hardware from scratch is something totally new to me.

Are there any European stores that sell the kits or parts to build these keyboards? I've had pretty bad experiences buying stuff from outside the EU. If something is faulty, broken, etc., you're pretty much SOL, while in the EU you can return it and get your money back.