I'd suggest a glass key and some duct tape for the cover (duct tape makes a dandy hinge.) Since you have the glass to do it. Cutting it isn't that hard, and since you seem to have a little extra you could make a couple of practice cuts on a corner. Then after that there's the old lighting standby of a shop light fitted with daylight fluorescent tubes. I'd imagine that you would get all that for maybe $20 or so.