The best way I've found to layout my cage is to use paper towels instead of bedding. 5 of the half sheets fit the tank perfectly and are extremely easy to change. (this is for a critter cage, such as Petsmart sells. I think it's a 20 long.)
I have a UTH on my hot side plugged into a lamp dimmer (get this at Lowe's for $10) to keep it at a good 95˚ (otherwise it gets up to 120˚ and that's a small one!). My cool side is just a lamp with a 60w bulb and it's a perfect 83-85.
Also, when your snake is in shed, the paper towels will absorb water to help keep the humidity up. As for the lid, it's covered in foil insulation tape. PM me if you want to see picks of the cage!![]()