[mamcx]

As I tell in https://news.ycombinator.com/item?id=12679849 exist a whole sub-culture of build your own mechanical keyboard.

https://www.reddit.com/r/MechanicalKeyboards/

https://geekhack.org/

https://www.massdrop.com/mechanical-keyboards

So yes, exist people that build customized keyboards or (maybe) better, give info in how build your own.