[villagetinker]

A lot has changed since 2013 when we bought a lot and built, designer Gardenia, 3 stretches, lots of changes to interior items as well as picking outside color, etc. At that time once you bought the lot, construction had to start in 6 months, no idea of current requirements.
Some things to think about:
South facing lanai greatly limits direct sunlight, especially avoid west facing.
While we did get tile and rugs, we did eventually remove the rugs, consider your flooring very carefully, we also did not do the diagonal tile, which in hindsight was a minor mistake.
These houses have very little storage, build as big as possible.
Think about the future pool, access to this from the lanai, and make considerations for this traffic if possible. We did not want a pool, but did want a future birdcage, so one of the stretches was to enlarge the lanai.
If you can make decisions on windows, get the ones that stop around 18 inches from the floor, the ones that go lower seem to be more intrusive to furniture location, IMHO.
We had lots of additional low voltage wiring installed at construction, this saved a ton of money later, but it sounds like this may not be an option.
Speaking of wiring, if possible, I would definitely get additional outlets in every room, and the floor outlet in the living room.
Please feel free to send me a PM if you would like to discuss further.