I would think if its gs'd to no end and the water can't make it to the wood, it would be ok. There is a vivarium forum online, ask on there and see if someone has done it before. Someone with a little experience with it would probably be your best bet.

You might be able to use the laminate stuff for floors on your walls and floor, and silicon the gaps up. I have no knowledge if it is safe though. But an idea you could look into ya know