Three other points.
1) you will need a secure screen top, snakes are natural born escape artists and if there is any way they can squeeze out, they will be gone.
2) Many species do not require high humidity but for those that do, you will need to cover most of the top with a moisture barrier. Hard plastic of foil works well
3) Heating - you can get species that do well at room temp, but most will need some sort of heater. Tanks lend themselves well to stick on Under Tank Heaters (UTH). With any heater you NEED some sort of controller. Dimmer = cheapest solution, Thermostat is much better but significantly more $. Tnaks can be real hard to keep heat in, glass being such a good conducter of heat. I've seen many posts where they can't keep the tank warm. You can wrap three sides (on the outside) with a thermal barrier. Many folks use Reflectix. Looks like foil backed bubble wrap.
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
13.24 BRB
12.14 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 