I have plans to build one from the ground up using the new Stemma/QT/QWIIC network of devices with a raspberry pi. Thing is though I have to get the devices then lay them in and get a good mould for sculpt and residual casting for a good fit.
Well the screen is basically a bunch of LEDs wired to a micro controller. I was looking at using an LED matrix display set on mine for each screen and the upper left one. Then a membrane on the bottom buttons. The movie unit was a bunch of analog controlled stuff with a simple micro controller pre programmed routine.