Hi Jake
this may help if you are after a hull without the crease on the keel.
Take the keel shape and half of the deck shape rebuild and extrude.
you can then blend between the edges giving half of the hull shape you require mirror and join.
To get a curved deck draw the shape you want in the side view (shown in red) and use the isec tool
to create a new deck shape.Extend keel to match new deck curve and again extrude and blend.

Barry