If you use a uth make sure to use a thermostat (or you can get a cheap dimmer switch at Home Depot or Wal-mart....) they temps on a uth can rech dangerous levels with out a way of regualting them... so do that and make sure to have a temp gun to check the temps....As far as the screen top....you might need to tape the top (there is a sticky in here on how to set up a glass tank..) the screen lets all the humidity out...thus the tape.

Some awesome stickies are here to help you through it all...aswell as an amazing group of animal lovers! Hope you get everything worked out and a big pat on the back to you for doing your home work and getting everything PERFECT before you bring your new lil one home! Keep us posted

Also I dont know about the carefresh...never heard of it used for snakes *shrugs* I buy Harlams Aspen Bedding or sani-chips in bulk...use newspaper or paper towels when I run out...