Ps
@ David about the Pilou hull :)
As your back ground images are not with the file, (just empty frames :)
have you a grab screen for see the organisation of them?
for see what are the "straight lines" floating around on top view

And do you make some clean or trim before use images?

After a Rebuild, do you move theses "control points" for have a more fluent curve between other curves rebuilded?

What will be your strategy if thickness must necessary?
Shell? Sweep profil?...
And thx again for your enlight test!