http://liutaiomottola.com/components.htm

Use a spiral for the top curve?

http://thefree3dmodels.com/stuff/accessories/violin/21-1-0-247

Used free meshlab to convert to Obj
Use the free MoI converter Obj23dmWireframe converter to convert obj to 3dm
The model look pretty flat.

http://www.karlroyviolinbook.com/pdfs/Append682-3.pdf

Pretty good site here: http://www.kcstrings.com/anton-krutz-geometry (fibonacci based:-)
Some good cross sections to work with?

You can use MoI view image to "trace over" a picture, to assist in selecting the "right" curves and lines...