Draw surface between an ellipse and a shell curve generated from it

Hi, I have produced a surface starting from an ellipse and using attractor points along one of its diameters. I would like to create walls that span from the ground ellipse to the edge of the roof canopy.

I have tried a couple of options for surface creation, including loft and ruled surface, but without any success. Can anyone help?

ellipse_canopy__AB.gh (101.3 KB)

Using Loftwith “Align Section” option checked…

ellipse_canopy__AB_re.gh (102.4 KB)

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Loft options ‘Align sections’

ellipse_canopy_2021Apr23a.gh (102.7 KB)

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of course! I am an idiot