design punch sailboat in gsd

[michelefiorentin]

Hello everyone,

to practice on the surfaces I tried to "emulate" this beautiful video tutorial your youtube describing the creation of a parametric hull.Thank you so much for the creator of the video, even if you skip some critical steps.
what I managed to do following his directives (I had to reconstruct some steps) is a hull with discontinuity!
the hull that realizes with the various sections (without bow therefore) already has a tangence discontinuity in the lower central part (see the yellow line in connect checker, although the resulting surface can be thickened). I don't like using the symmetry for the fillet in the upper part of the bow, I would have used an extrusion.
but the main question is why he chose the solutions reported, especially those per minute 3:06 and that I show in figure. in practice I can't tell the right part of the figure.I wanted to ask experts some advice about it, before trying alternative ways that my (small) experience teaches. every advice is well-known!

greetings

allego file