Rich makes the good stuff, don't he?
Nice little setup, Icygirl! I know that some keepers of ball pythons remove hides as their animals get older. I've got eight tubs worth of RBI CB-70 rack, with a RBI hide on the warm end, and a plastic water bowl / hide on the cool. Most of my snakes spend most of their time under the water bowls, LOL.
I would be cautious about keeping the rack on carpet - I found that the carpet will push the center of the bottom up so that the tubs can be difficult to pull out or replace. A piece of plywood under the rack would solve this pretty handily. (It's what Rich recommends on his instruction sheet - but I didn't read it the first time, and as with most things, found out the hard way!)
~Bruce