This is some kind of a tutorial of how i prefer to do this.
1: Create desired contour lines in 2 projections. And make a group from them.
2: Craete desired profile in 3-rd projection (quarter-circle arc in this case).
3: Create additional “helper-plane” which i use to scale the sections more easily. And make it a group
4: Copy this plane along the axis of the first 2 contours. The more copies u’ll do the more detailed your surface will be.
5: This auxiliary planes will be used for [push-pull]ing and scaling the profile(or section) along the contour-lines more easily.
6: Start by copying and scaling the first profile (arc in this case) on the first plane. (by referencing the black dots where the contour-lines intersect the plane)
7: When scaling is complete [push-pull] the profile to the next plane and rescale as needed.
8: To see the profile more clearly, delete or hide the planes that you used already.
9: Delete all unnecessary geometry and smooth the remaining lines.
Post time: Jun-15-2017