I have used both aluminum and pet screen for custom cages. Pet screen is PVC coated nylon and is nearly indestructible. It also saves adult chameleons nails from being damaged when climbing the screen. Either one can be installed into aluminum rail with the correct size spline. IMO the commercially available screen cages are good enough and cost less for the time and material it takes to make one. (lll reptile is my favorite cage type)
It is a fun project though. Good luck.