As someone with zero formal electrical education and have built multiple keyboards, it really is easier than it looks. Just a decent soldering and a build guide

As someone with zero formal electrical education and have built multiple keyboards, it really is easier than it looks. Just a decent soldering and a build guide us all you need. Now, designing the PCB or hand-wiring (lik in the OP) is obviously a bit more involved. However, the most complicated circuitry is just a diode matrix. It really is that easy. Edit: not to take away from the OP -- his build is definitely impressive and time-consuming. But if you're thinking of designing and building your own keyboard, the concepts are quite simple.