As far as being able to stretch out...I know that when I had a special permit (re some hots) from CA Fish & Game, their stipulations included a formula (the details I
cannot recall exactly now but it's probably quite searchable) that had to do with the length & width of the enclosure compared to the length of the occupant. It wasn't
strictly that the length equaled the length of the snake, but it was far larger than what many if not most breeders provide: I thought it was quite fair, and they were
pleased with the housing that I provided (very large glass tanks with secure tops I made which couldn't be pushed off) per the required inspection. I'm pretty sure that
at least some other states have similar regulations, fyi. It's not something they go looking for, but if you're in violation of another thing, it's the sort of thing that adds to
whatever you're in trouble for. Happy to say F & G was always very nice to me, but that's what happens when you reach out to them first...it's different if they have to
respond to a complaint about what you're doing.