I'm a great advocate of tanks as big as you can afford and fit in your home.
Rule One is that it needs to be escape-proof for the size of snake you're putting in it. Might seem obvious, but small Corns have escaped by squeezing between the overlap in sliding glass doors of larger vivs. Scary!
The other thing is to make sure you have lots of hides and ground cover so they can move between warm and cool temperature zones without being seen. Plastic foliage makes great washable ground cover.
Apart from that - go nuts!
BTW, it probably won't stop the "trying to escape" behaviour, but it'll give him more options to explore! I tend to think of this as their natural hunting behaviour rather than looking for an escape route. They don't need to do it in captivity (they don't know we plan to feed them regularly) but it's just an instinct for them.