Hi Michael,
Here is a spoon lofted from 4 profiles, as you described, I have projected a line onto the surface of the inside of the bowl, to show what I meant by being able to add points on the cross sections, and thus manipulate the bowl's inner and outer shapes.
This is method I use for many "shaped" models, such as canoes etc.. Is there a way one can do something similar, or am I just fishing.
Jess