I built a TOTEM[1] (same creator) and it looks stunning. Was a breeze to get manufactured (both PCB and resin printer case from jlcpcb, in my case) and assemble too!
The build guide is very informative and quirky, it has everything from tips in how to solder smd diodes to "use a sharpie to paint the PCB sides black so it looks nicer", way better than some expensive kits I've bought in the last few years!
Geist's boards are amazing. I own both KLOR and TOTEM but still want to build a KLOTZ and use it as travel keyboard.
Custom keyboard rabbit hole is so deep