After looking up the Monster, Boaphile and rethinking about the AP cages, it's all pretty expensive. I think I'll just help with looking up DIY's with sliding glass doors. The cages with hinges didn't work out so well when he (being my friend) went out of town and the snakes lunged forward at me when I decided to clean their cage...

I'd appreciate it if someone can direct me to a site that does it step by step, or even a video or directions. :)

Thanks for the responses!