When snakes get this big usually somewhere around 7-8ft only seems to be realistic and convinient for an enclosure. Unless you build your own, a enclosure that size and/or bigger would be expeeeensive. Im sure all big python owners wish they could have some huge zoo-like enclosure but it doesnt seem realistic.

When you have snakes this size it seems manditory to take them out more to get some excersize. When you own smaller snakes its easier to spoil them with space but with bigger snakes things seem to change. So taking them out more often is the best you can do.