A 29 should work just fine. You can make a baffle by having the pieces of glass cut for you at your local hardware store and securing them with silicone. That way, you can customize it as you wish. As far as lighting, there's a cheap, easy way to light macro in a
fuge. Home Depot (and other home imporovement places, I'd imagine) sell floodlights with compacr flourescent bulbs sealed inside. Just get one or two of those, and some clamp on lamp holders and you should be set as far as lighting goes.
Here are mine:
