wow thanks everyone for the responses.
fat boy- thats exactly what i have now, the doors have a lock on them also to keep the snake in & curious kiddos out. i plan on getting a paper background to put over the back & sides. i'll have to cover the little bit of screen on the top with something to keep the heat & humidity in. i DONT plan on putting any heat source inside the terrarium. the corners arent really vented as much as it says so i dont see it having a problem. im gonna have that background covering 2 of the corners anyways, so whatever air escapes, it wont be much.