Abstract: A rotational molded boat or equivalent floatable marine structure has parallel hull walls interconnected by rows of spaced apart, molded V-shaped connectors. The connectors are formed in the rotational molding process. One of the mold sections has a mold surface for forming one of the hull walls, said surface having one or more rows of V-shaped indentations projecting toward an opposite mold surface. The V-shaped indentations have apexes that are spaced apart from the opposite mold surface by a distance that, during the molding process, will fill with molten material to form a molded connection between the finished hull walls. In another embodiment, a lattice structure is assembled to the mold and molded in between side wall components of the hull.