Thank you for the links. I've read a few care sheets, but the more the merrier.
The 'basking spot' is actually the surface temp above his underground heater- ambient is 85F at the warm end. I'll tune it down a few degrees though so I don't roast him (I'm used to 160F basking spots so this low stuff is new to me). I'm using a herpstat to regulate the temperature.
It's hard to keep the ambient much higher in this tank as it's room temp at the lowest point. The wooden enclosure will make it easier to maintain proper temps as room temp won't have much effect. Is it imperative I raise it asap? I can move him next to the bosc enclosure which throws a lot of heat if need be.
Thank you all for the great advice so far. This is my son's first snake and we want to make sure he is healthy for years to come.