Michael,
When copying edges in this manner, from an existing surfaces edges, then running "RebuildCurve" on them, I was wondering about the deviation from the original. When I run the rebuild curve, I pay attention to the "ghost original" curve, that I will be deleting, and try to add as many points as needed to have the new curve follow the original curves path. I was wondering how this new curve may be "Not equal" to the old one, in that a join of the new surface created from it to the old original surface would be "not watertight".

Is it acceptable for me to assume that my "visual reference" will work? Is there a method to be sure? is it more "grey area" and the only real way to be exact is to not rebuild it.

I appreciate your input here,
Burr