Thanks Paskal. For your timely response.
I have another question about the best method to insert a validate smooth cross section for produce a surface from a curve network command.
My job is focused on marine canvas. Like as said before usually I measure the boat with a special digitazer then I followed your advice to use the measured lines as a guides and I try to produce first a border curves and later a cross section curves for get the best surface result.
I need to find a compromise of speed and accuracy in smooth surfaces, and try to follow the real attribute of the surface like a canvas material.
I hope my explanation is clear enough.
I leave you the file with a border layer and cross section layer, so you can understand where
I send you also some photo of the old canvas
thank you in advance