The trouble -- or part of it -- is that I'm doing this by the traditional method, i.e. a "lines-drawing". I think one needs a few years of work on this method, with paper and pencil, before adapting the process to MOI. If you don't know how to make a lines-drawing, you have nothing to go from, or to. If you do a google: "yacht lines drawing", you will find some examples of these. I looked and couldn't find what I though was a good example, so I'm not offering anything here. But basically, you design the hull entirely in two dimensions, with sections corresponding to 'x', 'y', and 'z' planes. As I said, the trick is that all the points which correspond to intersections -- in three dimensions -- must be coincident. Once you have all the sections in 2D, you can select, move, and assemble them into the 3D form. Then, 'Network' will add surfaces. BTW, you need those 2D sections in order to figure the displacement (which we usually do using 'Simpson's Rule'). And if anyone is really interested in this subject they should get a copy of 'Skene's Elements of Yacht Design'.