Me again ;) I've made a little try and it's possible to start with a Spline object as you did to create the profile of the guitar . Once the profile is drawn, do Section menu > Cross-Section Options and uncheck Fill Cross Section . Now you can convert to vertex (Edit menu) with a 400% fidelity . Delete the front side and you should have a good extrusion profile . Then, the Viewlet technique will do the trick . Good luck, i think you're close :) ! PS : Hum, yeah i know, i'm not a good guitar designer ;) litst