With vacation here I've had a chance to make a few iterations of printing, finding aspects that need improvements, heading back into FreeCAD, and then back to the printer. I think tomorrow I'll have enough to do a first fitting of the electronics inside the shell!

I ordered an image sensor module but it won't be here until January so in the meantime I'll use a dinky Pi cam v2. If all goes well during assembly tomorrow (after a morning of festivities, natch) then I can start playing with the software to drive and read the touchscreen.