Cage top is framed chicken wire. The brackets are bolted through the left side of the cage, then the clamp lamps were threaded over the dowel, the dowel was then bolted down to the brackets. Glass will also help to hold the heat in better. Also, I would replace the chicken wire with hardware cloth, which should hold up a lot better. That all depends on the prices you get for materials locally, the quality of the materials you get and if you build it yourself rather than hiring someone to do so, as I did.
Iguanas are individuals, with individual personalities.
Add heating elements one at a time until you find and maintain the right temperatures. While the Condo was, technically, too small for Rex, it needs to be noted that she did NOT spend 24 hours a day in it. Rex was let out to roam the house frequently.