Thanks, I help my buddy at his zoo building every thing from anaconda cage to five foot snake cages, Im the guy he calls when he needs something like that, I was going to frame the whole thing with 2x4 and have them about 6'' apart for top support I was also going to use caulking on the edges and seal the whole thing with a urethane primer, I have had big water leaks in the past and I dont ever want that again.