He's curled up in a 40 breeder so he looks rather small in it. I can stuff him in a 10gal though.
Balls aren't big; a large specimen is falling well short of 5'. My 2 year old Dumeril's Boa is already longer than my BP. Not quite as thick though.
I had a 6000 gram Female that was just a inch over 6'......I've seen a few that big over the years though.......Not common, but not un-common either......