Also a good idea is to cover 3 sides of the tank for more security. You can get the aquarium background and tape it to the outside of the tank (don't put tape anywhere inside the tank that a snake can get to - it is super difficult to take it out if it gets stuck to the snake). It also looks nice.

For humidity, you can use cypress bedding - it retains moisture better. Then put cardboard wrapped in tinfoil over the screen on the top of your tank leaving just enough opening for your lamps. You can get a bigger water bowl and even put small containers of damp sphagnum moss inside the tank.

Also, about the thermometer - you can get a temp gun instead of a stick-on therm. It's a bit pricey though but you can use it to point at any part of your tank to read the temp on that point. Or, for $12-$14, you can get the Accurite Indoor/Outdoor Thermometer/Hygrometer with probe. Walmart sells them. It comes with a wire that you can put on the substrate on the hot side (you should put a hide on the hot side for the snake, then you can put this wire under the hide). This would be the "outdoor" reading. Then you stick the unit on the middle of the tank to get the ambient temps on the "indoor" reading. Then it also measures your humidity on that same unit.

Hope this helps!