Have you tried looking at bird cages? I have a couple cages meant for larger birds (small parrots) that are about half a metre deep, half a metre wide and a full metre tall. I used these before I started making my own wood cages.
The bars are close enough togther that chameleons can not get out, the powder coated metal bars make for nice smooth easy to climb surfaces and dont rust, the pull out tray is easy to clean away poops, and I got ones that have flat tops rather than curved so that light fixture rest easily ontop.