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. It's an ortholinear ‘board, which may take some getting used to but I'm hopeful that the extra keys (5x15 = 75) will let me add Fn keys as I miss those from the GK61.
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.