If you're not afraid of being just north of Tampa you can check out Pilot County (X05) and Hidden Lake (FA40),
https://www.hiddenlakeairport.com/ , both are airpark communities that seem somewhat active. I don't have any further information but somebody else may. Another few options just outside your square would be Spruce Creek, which is huge, and very active, and Leeward Air Ranch, which has a real strong homebuilding / vintage community.
Chris