gaps and a huge amount of points on curves ... don' t forget to rebuild

the central part have issues ... lonely faces .... better to contruct this as an extrusion + boolean hole

and 2 half hulls ... union give the baby solid

i add a round piece ... à l'avant qui fend les flots ;) ( 3dm joined )

ps i can't reproduce the exact shape of your hull ... cause you post the result of the network and not the curves needed to built it ;)