The ideal size for a Veiled Chameleon habitat is 24"x24"x48" so this is already the perfect dimensions for a chameleon. I purchased this habitat after I spent a week trying to make my own, but by the time I got all the materials I needed to make a decent habitat at those dimensions I had spent well over the price of this product. This product came shipped with the screens already assembled, you just have to follow the easy instructions to screw each panel together into the rectangle shape (took me about 30 minutes because I had attached one side the wrong direction by accident).
There is an easy access opening at the bottom which you can open to make cleaning easier, but I have yet to use it because my Chameleon is easy to clean up after. The habitat is sturdy when assembled though may not appear that while until the sides are fully attached.
If you own an Iguana this is NOT the habitat you should be buying. The screen isn't made for the powerful feet/claws Iguanas use to climb and they will ruin the habitat within days (I recommend custom habitats made without window screen in the case of Iguanas).
The top of this habitat supports my ZooMed deep dome + the mercury vapor bulb, AND the normal dome lamp with a night time bulb. I honestly wouldn't recommend more weight than that though, as my screen started to sag a bit.
All-in-all the best habitat available on the market for a chameleon, and a better price than most custom-made habitats will cost.