thank u so much for the deep dive answer i got to my question. i just realized, that i tried to make my problem kind of easier, because i expected an easy answer or concept that i could use for my issue. maybe its better to share the code i adapted from another blender user :

every side of the main-mesh-plane has a fix element (in the picture example 6m) and the rest is averaged at the ends (x). This x is changing everytime i change the size of the fix element, or when i change the form of the main mesh-plane.

for architectural purposes, i managed to extrude the main fassade elements but not the corners.

are the mentioned concepts still useable for this specific issue?

thank u so much for ure time!

old post:

"First time around here and hope to get some help for this problem: I didn't manage to fill the corners of this setup with faces. I got only the vertical edges but not the horizontal ones, which I could easily extrude.

Quite new to geometry nodes...

Appreciate any idea / suggestion!