As long as they have access to both sun and shade you should be good. Watch for birds that may want a snack and also as said already they can sneak away quickly when they want to.
If you cover 1 or 2 sides with solid side it will keep the mist from getting walls and floor wet. Also make sure you incorporate a drainage tray/system
For indoors in my area we have cold dry winters so my cage is a DIY hybrid. I wrap three of the four sides in window film plastic to hold in mist and humidity. If you are building from scratch you may want to incorporate some solid sides from the start depending on your indoor conditions.
I would guess even the weight of an adult veiled could rip the vinyl/plastic mesh if they were to screen walk. Most commercial chameleon cages use aluminum. If you can find larger aluminum mesh this will reduce the risk of claws getting caught from screen climbing and allow in more UV.
Depends on the use case of the cage. For outdoors large mesh like coated hardware cloth is best to allow in wild feeders. Indoors you want to keep bugs in the cage so traditional window screen mesh is probably best. All sizes of mesh have different effects on UV passing through FYI. Some can...
This seems to be a fairly common issue with male panthers including mine. Luckily I have been able to assist him in pulling it back in every time with some KY. Just like your experience he prolapses after almost every bowel movement. Happy he pulled through!
I feed as many wild bugs that I can get my hands on. I obviously avoid any I know are poisonous or could deliver a sting. I think the caution with wild bugs is a bit overblown. I regularly try to find evidence or examples of wild prey causing harm either due to parasite or pesticide and it...
They will always take the path of least resistance just like us. I would put the feeder cup further away where he has to shoot and see how that works. You can also control release the feeders and see if that gets him more engaged. If you want to see him really shoot his tongue get a wild...