I attended the Orlando NMRA national convention a couple of years ago. The Florida NMRA Division appeared to be very active. Your best bet might be to contact someone from the division about Gulf Coast 2 rail O scale railroads.
There was one On3 layout on the tour modeling the DRG&W. It had an interchange with a standard gauge 2 rail O scale railroad. The owner was a Master Model Railroader (MMR). I think he was located in the Tampa area but I am not sure.
Only one layout was in a basement of all the the layouts on the tour. All the rest were in an out building or a garage. One person bought a separate house for his model railroad. NH Joe