Idobo75

The Idobo75 kit from YMDK comes with a coffee-brown aluminium case and backplate, and hot-swappable, QMK-programmable PCB. I’ll be installing Kailh brown switches (because I have some, and to stick with the coffee colouring) and DSA keycaps.

Nyquist

The name Nyquist comes from the Nyquist sampling theorem, which says that if you want to sample a signal to convert it from analog to digital and be able to uniquely reconstruct the signal later, then the sample rate has to be twice the bandwidth of the signal. So here, if you want to sample this PCB, you're going to need 2 of them.