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I've been collection particular switches, including five MX Locks, for this, but before I move on to making a plate and case, I realize that there's a bit of a problem with it...
I don't know of any firmware that can do permanent programmable function keys, let alone 120 of them. Nor do I have the slightest idea how I'd build a Compose function into a keyboard, instead of just using WinCompose. Or a Mouse Mode.
This is the dreamboard, though.
Except for the split spacebar, this layout is quite similar to the Sun Type (5, 6, & 7) keyboards. Did you get inspiration from that?
Bingo! It was one of my main inspirations, along with the IBM XT. When I saw those Sun keyboards, I just HAD to try a compose function, and found WinCompose to be an extremely cool thing. It's also a confluence of a bunch of other factors: My favorite build right now is a silenced SKCM Orange 60% with keycaps from a Canon typewriter, but as a 60%, it's not exactly the best for gaming. Additionally, I've notice that I only ever use one thumb on the spacebar, so I wanted to do something with that... Also, I wanted an MX-mount board so I could collect a greater variety of keycaps.
All of that came together, and now I really want to make this super-functional battleship of a board.
Oh, and the plan for the switches? Locks on Caps, Fn, Mouse Mode, Scroll Lock, and NumLock, MX Dark Blue on the alphas and numbers, Hirose MX Orange with quadshot caps on the numpad, and Gatistotles on everything else. All of those are ready, at least.