Bad result when splitting pattern from surface

Hello,

I am brand new to Rhino, and using it for a school project, so apologies for my ignorance. I am trying to cut a pattern out of a curved surface, and have had intermittent success but more often than not, much more of the surface is removed than I would like. When file is rendered, or viewed in ‘ghosted’ view you can see that several ‘panels’ have been cut out of the side in addition to the pattern I am trying to remove.

Is there any way to fix this? I’m afraid I may have lost my opportunity to undo. I do have a backup of the orginial ‘shell’ with no thickness or patterns removed.

Workflow:
Project Pattern
Extrude
Cap extrusions
Move extrusions down through surface
split extrusions from surface

Thank you!

projected.3dm (5.7 MB)

you can use the command _Untrim
For things of fate; error of these curves were a bit more on the edge


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Thank you very much, I see I was careless with some edges.

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