There's a thread on here somewhere which shows my old broken Tornado's good hull became the main hull of a Tri between Hobie Tiger hulls, was built so that he could sail it as a F18 or booze cruise with the mates on the Tri just by bolting on the beams of the day. No reason you cant have your F16 and Tri. Longer beams, centre hull the size you want, couple of tramps and your away, a long crossbar and you even have trendy ama rudders. Get Dcarls to help you with lifting foils and your good to go.