1500 miles away, sitting in storage, I have the motherboard for one of these which is entirely different from the 2 console versions I've seen or the "PC" version on your page. It's one AT formfactor board, that has everything on it including CPUs, BIOS, 2 locking ribbon-cable-end-style joystick ports, several 50 pin SCSI ports (?; also plain-old-rectangle variety, but unevenly spaced with an expansion board plugged into one of them), video/sound jacks, and a FDDI controller. I'm guessing it's probably a prototype of the one on your page, and it has what appears to be a prototype number hand written on a spot next to the "development station" printing on the board. Anyhow, I just wanted to see if this is rare enough that I should rediscover it, and take pictures. I had assumed, since I saw one on eBay a few years ago, that the ugly PC case one was what mine would look like if it wasn't so incomplete, but now that I've seen the insides of yours, I think I must have something else. Mine doesn't even have a red PCB or the port for that NuBus looking addon board.
Update: I forgot about the lock/key situation, I might just have to wait until my next visit, but then I can take pictures of my full collection and some friends' stuff too.