Im really green on Vcarve and Im not sure I follow you 100%
Looking through the vcarve reference manual, I think your referring to using the 'Create Vector Boundary From Selected Components' tool.
I tried selecting the entire model and ran the tool and it traced the outline. I then though you might have meant to use it on the comprising vectors individually but that results in the same cut path that I started with.
I really appreciate your response and was wondering if you could please elaborate a little on the process? Pictures are bonus points