I've spent the last few weeks working on I/O but the keyboard is one of the main I/O devices so it kind of fell into the mix. The good news is that the keyboard itself works as intended: no messed up traces on the PCB or the like. The bad news, not that there was much bad news, is that I was short a couple of key switches and had to order more. There is not much more to say about the keyboard beyond that it works and I think it looks great. The keyboard, less the missing Space and Backspace switches, looks like this:

While an actual MCM/70 keyboard looks like this:

Not identical, but close enough.