I've stalled out on this project. Instead I am now working on a similar project: https://hackaday.io/project/13077-retroriter

What happened? Mostly I got bogged down with trying to figure out how to make a custom display driver in Linux. I had some leads and could have probably figured it out, but I've run of of interest for the immediate future. The Beagle Bone Blacks that I have are currently occupied as well.

So one day I'll pick this back up. But for now I'm working on learning though making a Raspberry Pi based mini computer with a thermal printer (and this time I'm actually making project updates).