I've got a few adults that I'm currently housing in BARRS 20x20x20 cages. I've used BARRS for years with geckos and other snakes, and I'm finding them so far to work equally well with juvenile and adult chondros. Plus, for the price, they're really hard to beat.
Also, over the next few months I plan on building some larger adult and breeding cages myself. We'll see how that goes. lol
One thing to consider with chondros is that super tall cages are not really necessary. You want to provide just as much horizontal space if not more than vertical space.
Arboreal Addictions dot Com