last minute questions!

[iBaman]

so next weekend is likely when I'll be able to start on pajamas' enclosure...and I have a few last questions. What sealant should i use? I'm going with cabinet grade wood, which will be finished, sanded and then sealed. How do you put a ceramic heat bulb in there without making it dangerous for the snakey-poo? (this is a just in case question, as I've been having super problems with his tank). How much plywood should I use for the frame? (I sew stuff, not build. so sue me). umm...any other advise will be appreciated! (also, I'm doing casters cause I'm a lazy *** when it comes to moving.