Surface tehnique for canvas manufacture

Hi,

I'm a manufacturer of canvas canopy for boat. I need an advice  about the grasshopper capability to make a smooth surface from a border curves.

I'm trying to find a compromise between speed and accuracy, still the accuracy is 10 mm +-

My way of work is to measure a boat with a special digitazer, after that I import the polylines curves that follow the shape of the boat to Rhino.

After that I draw the  interpolate curves using the  polylines as a guides. After defined the boundary curves I need to define the cross section and later the surfaces.

Because usually all the projects are usually custom, I'm trying to find a quick way to get a validate surface. This kind of tehnicque is more appropriate for more complex shapes.

I left the file and some photo of the old canvas, so it is easier to understand.

Any kind of suggest is appreciate.

Thanks in advance.

Lucky