How to isolate horizontal curves for loft

Hi there,

I am trying to loft these curves into panels, however, using list item is not consistent in getting the same top and bottom curves that I want.
I know there is a way to cull them out and use insert items however, it would be very tedious and inefficient. If anyone can help me that would be great!

Align (41.2 KB)
Thank you

Here is one option
Align (46.0 KB)

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Here is another suggestion to simplify your definition.
Align (23.4 KB)


Great ideas thanks for sharing them @Adam_M

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