I would agree with Buzztail1, ten gallon tanks can be converted into safe enclosures for a small crotalidae. I have a similar design for the lid that has a key lock as well.
What's amusing is how many people state that the sliding screen with a pin is unsafe for any venomous. I absolutely agree. The funny part is I know of at least one AZA zoo in Texas that has reserve cages with sliding screen lids in commercially made tanks with less than 1/4" glass.
They had 4 foot atrox, 5 foot naja, other elapidae and even bitis in these type cages.
I am not saying that they were PROPER by any stretch of the imagination. They would have been breaking several state laws if they were elsewhere (ex. FL, OK, etc).
I'm just amused as to how the zoo people think they are so much safer. Grant it, they don't sell hot snakes to inexperienced18 year old kids ( or even 40 year old inexperienced idiots) like some of our fellow hobbyists.
Anyway back on topic, I would say that a 10" crote in a 10 gallon is fine if you modify the lid (meaning build a better one the has a key lock and double screen).
Good luck,
T.C.
TCH Zoological