Cabin indoor pools (building questions)

[Kyle Smith]

I'm about to build a 3 bedroom pool cabin in Wears Valley/PF area and I noticed most of the new cabins have pools.  Are most pool cabins being built fiberglass, vinyl liner, or gunite pools?  I want to go with the best bang for the buck and durable.  Also, I was curious how they are supported underneath.  My cabin will be on a pretty steep grade and will likely have 3-4 levels before I get to my basement level.  Thanks in advance.