Great plans - esp. the insulation.
For a vapor barrier, we no longer use 6 mil in Ca. Minimum is 10, but 15 has become more and more common. We are also dealing with rocks from time to time, and the 15 is more resistant to punctures. Based on what I've seen of Florida soil that may not be an issue there.
We use a lot of Stego in home construction these days. I slightly modified proprietary recipe of plastic/poly-olefin. It is extremely rugged, expensive, but much less permeable than anything else on the market out here. I can't say if it's good for FL though.
Stego Wrap Vapor Barrier | Products | Stego Industries, LLC
I see the plans call for welded wire mesh - is that standard in Florida? A lot of our slabs are over engineered (by others) in my opinion, but we don't have much demand anymore for WWM. Normal around here is #3 or #4 rebar 18" on center each way, and sitting on a 2" "dobie" that keeps it from sinking and ending up at the bottom of the slab.
That's a lot of unasked-for advice - not to mention I'm in another part of the country. For now I will just check back periodically and hope to watch the progress!