I can do that in 30 seconds, Cadkey /Fastsurf. ( Dunno about Rhino )
Now since I am thinking Necks and Fretboards,
Must these curves be linear and circular form?
I have 3-d digitized point data
Can they be section of an conic, spline, or any curve?
What tolerances, is there an average Neck?
Fastsurf can bang out the surfaces easily.
(any and all surfaces), and solidify the model.
I wish to do a parametric neck machining program and need to know this.
I can help you with surfacing anything,