Loft of the building contours

I can’t get the shape of the building contour curves to stitch together correctly using Loft or Ruled Surface.

Maybe I should set up the attractor graph in a different way so that it doesn’t distort the curves too much, but I don’t know how to do it.

I have tried rebuilding the curves, however the top surfaces are not cutting into the contours (16.1 KB)

unless you want to loft all your curves together into a weird surface that goes through all the curves in your list, you need to supply couples of curves to be lofted together into separate lists:

also, you need to tell Polyline component that you want a closed polyline, so it will also draw a segment between point index 0 and point index -1 (20.8 KB)