I am getting ready for the first test run. The PCB is starting to get there and the most important parts have just arrived
I have also picked up a small arsenal of used TI84+ on eBay:
A backlight is also not completely out of the question. I may consider adding right angled SMD LEDs to the side of the screen, if I can afford that in terms of space.
I have received diffusion film along the LCDs so I could add a backlight if I wanted to.
I have been rather busy recently, so there has not been a lot of progress, but the coprocessor is now almost completely wired up.