Clear Case Door for Mac Pro

I dont think anyone makes them (cant even find anyone in the US that makes a CPU stand for a Mac Pro). However Tap Plastics will fabricate one for you if you give them the specs, and you should be able to find a 3D model or exact specifications for the door panel if you hunt around a bit.

It is very problematic for companies to offer such a door. It would change the EMI/RFI characteristics of the machine, and would need some wacky adjustments (like a grounded layer of vapor-deposited aluminum) to get them back into acceptable limits. The testing to measure the radiation is extremely expensive.

If you don't care if your TV set gets knocked off the air by excessive electromagnetic "noise", just hunt online for a documented "project" door and make one like it.

Plexiglass cuts real nice on a table saw. Just go slowly so it does not heat up the blade and start to melt.