I made a place for Sheldon to soak up some sun! I added a elevated floor so I could have the paint roller tray as a little water area to help him regulate his temp. Then I added the lip on the top so he can't escape (he's like Houdini I swear), and it adds a ring of shade so he can get out of the sun if he gets too hot.
Also, on really hot days I can put cold water under the floor and I think this will help it from getting too hot in there.
He loves it! Every other thing I have built he has just frantically tried to escape the whole time. In this thing he seems to have accepted the fact that he is stuck in there, and when I startle him he slides into his water dish and I can tell he feels secure.