Ok, thanks Michael

>But you seem to be asking about making the resulting surface match a curve which is
>totally separate from the cross-sections given to the surfacing command?

Kind of, the yellow curve is my guide line so that when I trim the surface it matches the profile of the yellow curve in plan and side view.

The problem I have is figuring out what shape the red curves need to be so that when the surface is trimmed it will be close match to the profile of the yellow curve.


I never considered loft to create the fillet as both network and 2 rail sweep work for the fillet.