I'd put a smaller water bowl in there, and put a "cool side" hide in, for sure...because the bowl takes up the whole cool side, the only way he could thermoregulate would be to soak in his bowl.

I'd also replace that cardboard hide with something you can wash when you clean the take--and while you're getting it, get 2, so they're identical

Also--if your UTH isn't regulated by a thermostat, I'd definitely look into getting one of those, too.