Wall perimeter or wall projection on surface

Hello,

I need to get either a closed curve or a surface, as a result of wall projection in Z axis direction (aka top view).
The purpose is to use this curve/surface as a part of the new crop for a given Revit view.

I managed to get a Solid from a Revit Wall, but the “Surface.ProjectInputOnto” didn’t give any result (“Empty list”).

Would be really glad for some tips and recommendations.
Thank you.

Edit: I could extract wall’s location line end extrude it horizontally with wall width, but walls are usually longer/shorter than location lines, as they connect with other walls and extends themselves. So I don’t consider this as a propoer workaround for my task.

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@imigas434 ,

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