An article of manufacture including molded-in notches in the peripheral edge of long, uninterrupted molded-in compartments in a rotational molded boat hull for permitting the flush fitting of certain independent structural members in said notches to provide both structural support and drainage of water away from seams between adjacent deck panels and hatches secured over the compartments without resorting to elaborate pre-fabricated decks. The article of manufacture includes a body, wherein the body is a plastic molded boat hull comprised of numerous molded-in cavities and molded-in features to create an interior layout that is comparable to a conventional boat built of aluminum or fiber reinforced plastic.