Need help with new setup

[brianb2157]

Hi everyone, new to this website been lookin at alot of blogs but havnt found one yet that I'm looking for maybe this post will help me out alot. Anyways I have always had little setup 10 and 20 gallons but here lately iv been building vision cages for my reptiles, and I have a green tree python that has to have high humity, so I built him this real nice cage out of birch plywood. So what I'm trying to figure out is there anyway you can waterproof the bottom of that cage to hold water, theres about a 6 inch lip before the door opens, don't just want to put a tub down there, the cage is 2ft by 2ft by 3ft tall. Wantin this to turn out real nice! If anyone could help please do so, and thanks