I have one of these from an interactive exhibit. The exhibit predated my time at the company. I think it was a common form factor based around the s-100 bus.
If you can, please 3D scan everything. The original units are incredibly rare and need to be properly documented.
I also have the documentation and cut sheets. How incredible rare? I’m getting ready to shed all the mass produced computers I have. Didn’t realize this was a gem. I admit I never saw another one.