I'm a huge fan of custom mechanical keyboards and after building a few am now at the evolutionary step of creating my own PCB and thought - I wonder if a MicroMod would work here? Turns out someone had thought about this back in 2000 - A bit of research lead me to the M60 PCB ( https://makerdiary.com/pages/m60-mechanical-keyboard ), but deeper dive shows that this is not compatible with SparkFun's implementation.
I'm keen to explore this as a viable project to undertake, starting with a standardized 60% form factor, a.k.a. GH60 - LadyAda for example sells a plethora of keyboard stuff, cases, plates, switches, caps ... all but not a PCB.
I would hate to spend months on prototyping something only to have something out there already done, just not easily findable yet.