My WC melleri was perfectly content in a large reptarium. My CB was fine in a 24"x24"x36" cage. I wanted togive him more room, so I took the sides out of two of them, and gave him a 48"x24"x36"H cage. I think I've caught him on the screen 5 or 6 times, max.
I moved him into a 6'x6'x3' cage. It had no door for nearly a week, and he never made an effort to leave it!
CB's are often much more content in a cage than WC's.