Awright! I’ve never done anything game related ever, but I kind of like the monolithic nature of this challenge - so I’m in right now!
I’ve got a sketch already, just have to go pestering my neighbours and see if I can borrow a scanner for two minutes.
The plan is to make a pretty high-techish box containing some really evil über-weapon. My prop would be used in something similar to a Doom3 engine, with a gameplay along the lines of a Sci-Fi adventure FPS.
More info when I get the sketch scanned and posted.