I'm a carpenter and herper and this is good advice! Not only are the fumes bad, but raw wood will absorb moisture ( urine, spills,) etc.. and you want the sealer or paint ( on the inside of the viv.no stain inside) to be:Real cool and a good cheap way to go. Just make sure you coat the wood. esp if the plywood looks like it has pine in it. Which most plywood does. It is bad for most snakes and lizards.
We are getting heating pads with a thermostat, that way we can monitor the heat.. The room they are in is already warm, so it should work out great. I used some poly urethane to seal the inside. They are airing out right now to eliminate the oder.