I used to own a Caribbean Crosby 1963 vintage boat with back to back seating on both driver and passenger side. Made from marine ply frame, foam covered, with removable seats and storage pocket between, it was a simple but strong and practicle design and glass bonded to the floor. With approx 100mm clearance under seats you could store extra stuff under seats also. Does anyone know where seat frame designs or plans could be obtained for back to back seating.

Trikky