Reading through the thread, I can see you already got the information you need but I'll chime in with my setup too....

I do house my RTB and ball in the same room. The RTB is in a 55 gallon tank currently until it out grows it and then I will build an enclosure for it. Though I may get lazy and just buy a boaphile.

It's hard to get everything right for a RTB in a glass tank. I am using a UTH for the hotspot and heat cable for a warmer area below the water dish and in some other areas to help with the ambient temp. I also put foil and foil tape around the sliding lid to keep some of the humidity in and help with the ambient temp.

So far so good. Generally it's 92 on the hotspot, 78-80 ambient and 60% humidity.

Good luck, mine has been a great snake. They grow fast and she's a cuddler.