you'll need to call the FWC and they will have an officer come inspect the boat... to be honest try to get them to just register it as a homebuilt boat- especially since you dont have a hull ID number on the boat... I had a little 14ft boat that a neighbor gave me:wrote up a bill of sale and had them sign it. The officer looked at the boat, ran the hull id number and had to go through 8months of letters to the state, who would then send that letter to the last person who had the boat registered, back to the state, back to me, finally got the previous owners info from my neighbor and he even wrote me a bill of sale,,, blah blah blah,, boat is still un-registered and just sitting onthe side of my house.
The state will want the last person who owned AND registered the boat to re-register it so they can transfer that title to you... huge pain in the .....and basically the state gets a bunch of $ from all the paperwork.
Homebuilt hull- its the way to go!