for the issue with the gap in the bottom perhaps a 1/4 bit of lament board cut to size to cover the entire bottom. A simple router would clean up the edge to it and you could fit in perfectly. You could even stain it to match the rest of the television if so inclined so it blends in perfectly. It won't look exactly like a standard tv but filling it with some sort of filler won't either, or you could paint the board itself black too. get rid of the gap and it'll blend in with the black trim to give it a more "stock" look to the tv.
It's a wonderful project though. More things should be recycled like this. It's a great way to make an art piece and keep some more trash out of the garbage dump.
I vote next you take one of those old giant 1980's televisions. The 42" screens inside of a case that was nearly as big as the wall it was against. For those of you not old enough to remember http://www.boingboing.net/images/_6a00d83452989a69e200e553ec3da58834-800wi.jpg lol
(yep, those were our 80" plasma screens back then) lol Imagine the stock you could keep in there!