Network curves limitations

 From:  JPBWEB
Hi guys,

I fail to see why I cannot get a nice smooth hull shape out of my network of curves. As far as I can see each curve is beautifully smooth and fair, but I cannot get a single surface to include the bow area.

This is very frustrating as I like very much to use the network tool to generate plane fuselages and wings, but ship hulls seem to be more elusive. I wonder why...

Any idea ?