Here's a link> http://motorbicycling.com/showthread.php?t=6427
to an old thread that addresses the issue of a custom front engine mount for cruiser style frames. Typically they have either oversized or curved down tubes that require a special engine mount. Nothing impossible to build but often necessary with the cruisers.
Good luck and keep us posted on your build.
Incidentally, you live in one of the best areas of Florida. Do you know Englewood? Stump pass? Lemon Bay? The Rum Bay Bar on Palm Island?