The Ribs are the easy part. They are there already, you just don't see them because I have those layers shut off. The ribs are the lines extruded 1mm sideways, then the profile curve is extruded enough so a flat can be cut and the part is mirrored to the correct beam at that point. One could be sloppy and stop there, but it is better to lock those parts in place, duplicate all curve edges involved, then join them into one piece (removing any overlapping curves on the same plane), this is to make sure there are no double lines. Those lines are joined into 1 curve and that one curve, moved to the side a bit, is extruded as a solid, for 1mm, and you rib, or former, is made. It is at this point that one can add or extract as necessary, control points, to further shape, or fair the hull as necessary. Any slots for the for and aft connectivity can be cut at any time, even using the same longitudinal framing as the cutting tools. That way, the slots are exactly where they need be. As in any ship model, you make the framework and the attach to the deck. This is going to be bigger than I though, possible 26" to 28" inches. Since the boat was made of steel, I have to try and find some better pictures, to show the weld lines. This will make a better hull break, instead of just a seam in the middle, which I loath.