I had the same ideas as the guy your talking about. Create 4 walls and put some type of screen/fence/mesh 3 feet under ground so the beadeds cant dig thier way out.

"Another cool thing he did was to keep his Chameleons outdoors in wire cages nailed to trees (with potted plants inside for cover)...he'd just spray them down with the waterhose... but what had me laughing is he'd sometimes throw dead rats/mice ontop the cages which would attract flies... the lizards would have a field day catching the flies..."

Now thats thinking outside the box lol... im not sure if id do it that way, but .....