About our free boat plans: the free boat plans listed here are public domain plans. we have put them together into a more usable format than most free boat plans. Boat plans for a classicly styled 25′ trailerable cabin cruiser. islander #799 a 25′ classicly styled cabin cruiser build in plywood; characteristics; length overall:. Plans show cruiser, fishing boat or sport fisherman options. a simple to build arc bottom, plywood displacement cruiser on a sharpie type hull..