You can buy 8ft enclosures for larger snakes, which will work for snakes up to pretty much 15-16 ft long. A friend of ours has an enclosure he built for his 14ft female retic that someone could sleep in and gives zoo's a run for their money.
If you are Brad rocks. And you are 100% right about his enclosure.
Mike
"They are biting out of excessive fear, not because they are mean. Mean is a human emotion and serves no purpose in the animal kingdom" - Kevin McCurley-The Complete Ball Python