[Gmsh] ruled surface question

[Einat Lev]

Hello all
I am trying to create a simple 3D box,  where the bottom is a wavy surface defined by a few splines. However, I can't find a way to create that surface. If I try to use a "ruled surface" using the outermost splines, gmsh ignores the peaks in the interior. If I try to use sub-segments of the splines, I can't with out splitting them. But when I split the splines using break points, they become straight lines instead of curvy.
Any ideas?
Attached is the GEO file.

All the best,
Einat
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