For I<3Dreamsicles

Ok I used the material you told me you wanted to use. 2x4's and plywood. The Plexi-glass is mounted to the inside of the door so you cant see the cut.
The Doors I decided to use magnets so theres no need for a lock. You would just have (3) magnets going down each door. Very easy and very cheap.

I cut 12" holes in the top part for your heat and daylight lamps. They are screened in that way the Iguana cant get out but also wont get burned

First picture is the framing and sencond is the completed. I can give you the dimensions, etc.... but I first wanted to make sure this is what you were looking for. It is 6'x6'x29" per your request. Let me know if you need any changes to anything you see.