[nine_k]

Would a prefab house (which normally satisfies various codes' requirements) be worth putting there?

[tekknik]

The issue with much of Floridas land is it’s wetlands. It doesn’t so much matter what you build on it as it is about minimizing impact to the environment.

[bombcar]

Even with a fully legal prefab house, you're often looking at anywhere between 20-100k in "other costs" besides delivery and installation.

You have to connect to water, sewer, power (or build a well and septic), you still have to get it permitted and inspected, etc, etc, etc.