Thanks for your thoughts, @jacobtothe.

I'm considering something like a Raspberry Pi maybe for a significant variation on this design. Like you say, it won't fit with this form-factor.

Ideally, if we went ahead with the design in the photos, we'd want to use a very small form-factor microcomputer. More like what's in a mobile phone, or something even more low power, perhaps even postage-stamp-size, since word-processing doesn't need much muscle.