I have used that for younger chameleons and have not had any trouble as long as they are good eaters. I free range my insects and just make sure to watch them a little closer but you will be fine with that size
Thats just the way most chameleons are and he could calm back down if you can earn his trust by hand feeding and trying to lure him out with food. Just dont force him to do anything or hell be very stressed
Yes but always when putting them outside they can get to hot, im guessing its not that hot yet but its always worth thinking of. Make sure to get some foliage and a branch or two to sit on
That mess should be ok if you get a 3+ months old chameleon probably but i think it would be to close so you might want to get a small cage or something until it grows a little which doesnt take very long. Dubia are great for all size chameleons