Very nice, looking forward to seeing this working. While you're at it ;) How about a modern day version of the Moog PianoBar? That would be a real game changer for people studying using acoustic pianos. They now have to install a very expensive silent piano system in order to get midi-out. If you could just stack a bar against the fingerboard to get midi-out that would be amazing.
Update: I coded-up a full-screen visualization to display on the screen. My setup has a 55" screen right above the piano, so there's great potential to make a pretty show.
Still WIP, but easy to edit: https://github.com/whyboris/Digital-Piano-Visualization
I used Processing because of how easy it is to use and how performant it is for smooth animations.
My repository for this (code finished, just need to add photos and add a write up about how to use):
https://github.com/whyboris/Digital-Piano-LED
I added a feature that the left and middle pedal buttons navigate through sheet music (PDF left/right button). And I'm also running Pianoteq which makes any (even dinky) digital piano sound like a $100k grand piano (or any piano you pick for that matter) https://www.modartt.com/pianoteq