For some, getting an 8 foot Sentec is fine for housing 16 foot, 200 lb. snakes.

For others, making a space that their snake will actually LIKE is what they want to provide. I use large enclosures, and I have a friend who used a whole room before. The room was awesome, and housed a retic and a burm.

Obviously, the expense and work involved is not as important to the OP as providing the best environment possible. If he wanted a tiny box for his snake, he would have gotten one.

Chris