Closed Brep - Double curved surface

I first mapped rectangles on a double curved surface and extruded them. I now need to cap these rectangles but am unable to do so. I need them to be closed.

Can anyone please help me? I’ve also attached the files. (1.7 MB) 12.12.gh (19.1 KB)12.12.3dm (1.6 MB)

missing

Are you saying Cap Holes fails on your extruded curves?

From the image you posted, they look distorted, as though the curves are not oriented properly on the surface, perpendicular to surface normals?

I’ve uploaded a rhino 5 file.

Yes, cap holes fails.

How can I construct rectangles on the points on the curve using the surface normals?

I’m trying to achive something like this

Unless you internalize your geometry in the GH file, I can’t see your surface or points using R5 so there’s not much I can do.

Hard to tell but those look like flat base surfaces with extrusions that DO NOT observe surface normal directions? It reminds me of this thread:

Four pages exploring the idea of “hairs” on a “thatched roof”.

P.S. Maybe this?

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Thank you so much, that’s exactly what I needed.