Hi scott,
like Michael said, it is easier to use a flat design and then flow it or project the flat curves
onto the surface.
What i usually do is creating a flat design, made of a closed curve, project it onto the
solid and then use the trim command. After that i use the trimmed surface and raise
or lower it with the move tool and finally loft the edges between the surfaces.
The other approach i use is shown in Michael's first link. Here i create also a flat
design and create a depthmap from it and then use ZSurf and MoI's flow command.
Both techniques work very well for me and in case final filleting should fail i usually
use free versions of Autodesk Inventor or Autodesk 123D Design to accomplish this
task.
Hope this helps!
[Edit] in order to loft the edges i usually copy and paste the edges and then join
them to have two closed curves, which can then be lofted.
Regards
Stefan
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