Hi roj, yup I think that for a case like that a projection of the regular curve/curve blend would work.
If the surface has more variation in it over the area being blended, then that may be problematic though.
Another possibility is if you can model a surface that has the general shaping that you want from the blend then you could produce surface/surface intersection curves by using the Construct > Curve > Isect command.
- Michael
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