Hi Scuba Lady, sounds like you are hot to build or buy. I built a nice little house about 25 miles north of AC 5 years ago and I loved it. Build with blocks and cement flat roof catch your own water, put it in your below ground cistern, pump it out with a 12volt shurflo pump run by solar panels on the roof. I had solar power backed-up by small dsl. gen, propane gas refrig., a 2,500 watt inverter powered by 8 golf cart batteries. The solar array I set up would float (fully charge) the bats by 2:00 pm.
The house was laid out with a large bedroom on each side, kitchen and dining/bar/liv in the front facing the beach. Equipment room that housed the pump, bats, freezer,(yes a small one set up on a timer) BBQ (gas), small reverse osmosis water purifier, and shelves full of everything you need in paradise. If I knew how to draw on this machine I would give you the layout. Or I can be a reasonable consultant!
I still have a lot on the north end of the Cay, above rocky point, that I dont know If I can afford to build on. I'll make you a deal if you have the real desire to be way away from the masses in town.
(Gettin too old) Bud