I was trying to design a boat with VW and gave up. Look at TouchCad. It does marine calculations. The control points on the mesh are alway on the mesh. It is 100% compatible with VW ... both ways. There are tutorials that show how easy it is to draw a hull on the TouchCad site.
Also, I can attest to the fairness of the hull lines.
www.touchcad.com
www.boatdesign.net forums has some posts on TouchCAD