What kind of coated screen is that? It looks like crickets could chew right thru that stuff. Also how are you going to view your cham thru it? It looks like its not going to give you a clear view of the chameleon. I would go ahead and change that stuff now before adding the cham. You just need plain old window screen for the sides and top. Also with that plastic stuff its going to be fire hazard around the hot basking lamp for your cham. If a hot lamp touches that stuff its going to melt and emit some god awful fumes. Replace that coiled bulb with a standard 5.0 uvb flourescent bulb and buy a clip on shop light and a 60 watt incandescent bulb for the chams basking lamp.