pighunter - questionnaire of a sort.

[prism_wolf]

Yes...the screen blocks up to half...and more. Regular window screen blocks half...the reptarium screen is even finer blocking even more. If you can do all Plexi...the enclosure would hold heat and humidity so much better. You would need a couple of vents for air circulation, but otherwise...the more enclosed the better.

[Merlin]

the lady at the reptile shop said those cages were awsome for reptiles?

Of course she did. They sell them.

Reptariums were originally designed around chameleons and other smaller animals and were never intended for anything nearly as powerful as an iguana. And without the high UVB requirements.
Unfortunately many reptile cages and other products are merely designed to look good without actual regard to the actual husbandry needs. For instance there is a UVB generating bulb out there (The Slimline) that comes complete with a plastic sheild as part of the housing between the bulb and the target area completely ignoring the fact that plastic sheilds out UVB!
As for your cage question.
If you use a mesh with openings 1/4 of an inch or better the light will pass thru. What I have is basicly a large wooden box with plexiglass doors There is a false top if you will of 1/2 x 1 inch welded wire mesh that my lamps and CHE sit on top of. This isolates the equipment from the cage. Then I built a box that sits on top of the false top which covers the equipment and seals in the heat and humidity. I have 2 approx 4 inch vents, one on either side that supply fresh air.
If you build it as solid wooden box it will hold heat and humidity just as well if not better than the plexi and with just the plexi on the front it will save you a whole lot of money!
They are proud of that plexi!