Happy holidays everyone!

I am looking for help with the water monitor cage I'm going to start building. I just got a hatch-ling U.S. captive born water monitor this week and I'm very excited to work with it. I live in south Florida and I'm going to build a large primary cage outside for it (15x10x8 or so), but I'm also going to build another cage for now. A cage it can grow up in for a year or so, and stay in during the few very cold nights we have here. I plan to build it 8x4x6. The problem with this is that I currently don't have any doors big enough to build it in my garage and then get it inside. I may be having big enough french style door installed soon but I'm not sure when. This basically means that I need to build it inside. I want to protect the lizard from any building materials used and also the cage from the humidity it will encounter. Id be building it in my 'reptile room' which is 12' x 25', but this is also where I keep my sav monitor and all of my snakes.

My fear is that when I go to use any sealer on the wood, the fumes will harm me and the other animals inside of the house. Is there any kind of wood sheeting I could use that isn't toxic to the monitor and wouldn't need to be sealed. Or is there any type of sealer I could use to protect the wood that is going to hurt my other animals while it dries? Even if I was able to build the cage in my garage, thats where I keep/breed my rats so the fumes could hurt them as well. I used some minwax poly something on part of my sav cage a while ago and the smell was rough.