hrmmm... perhaps I'll just be iguana-proofing the entire room... But that is still a ways away anyway... may not even be able to once the landlord is done doing renovations, was just trying to brainstorm the possibilites long before jumping into such a project.
The other option would be to convert the doors of one of my closets (and figure out where to put all the crap that's in there right now, lol) the dimensions of the closet are 5'W X 5'D X 7'H The floor is lenolium tile, and the wall is concrete with that wood wall siding stuff, so as far as worrying about humidity it wouldn't take much to modify it (also bearing in mind that I rent, so I would need to put it back the way it was when I moved) That'd give more floorspace than building a cage, and would also be as high as the cieling.