Help with rebuilding geometry

[ct.rhino (Charlie T)]

Hi,

I am trying to rebuild some wonky hardscape geometry.

The green surface, once exploded ,has some self intersecting surfaces which I am guessing cause the red surface to loft incorrectly. How do I extract the green “edges” and use those to loft the red?

ramp-partial.3dm (410.7 KB)

[pascal (Pascal Golay)]

Hello- is the attached anyrthing like what you are after?

ramp-partialP_maybe.3dm (268.5 KB)

-Pascal