Is there any provision for people who build their own boats
Fred
Yes, if you live in Canada, and sail in Canada... you are not required to get a title in Florida

just kidding... as far as i know.. these laws do not have any remedy... if you are from out of state.. you must have documents to prove you are legal in that state..
"I will be vacationing in Florida this summer. Do I need to register my vessel there?
Florida recognizes valid registration certificates and numbers issued to visiting boaters for a period of 90 days. An owner who intends to use his vessel in Florida longer than 90 days must register it with a county tax collector. However, he may retain the out-of-state registration number if he plans to return to his home state within a reasonable period of time"
"All vessels, with the exception of non-motor-powered vessels less than 16 feet in length, non-motor-powered canoes, kayaks, racing shells, or rowing sculls, regardless of length, must be registered through your local Tax Collector's Office."
http://myfwc.com/RULESANDREGS/Rules_Boat.htm#registrationPlease note: i am not an attorney, nor law enforcement in anyway... but i did stay at a Holiday Inn last night.