Surface extrudes it's defined boundaries

I am trying to create a volume from defined planes, however the top surface goes beyond it’s specified boundary. I’ve tried to trim the surface with trim brep, but I can’s seem to close the brep to start with.
How can I create a surface (or the overall volume) that stays within the boundaries?

Thanks in advance!

Upload your gh with internalized geometry (37.8 KB)

I’ve uploaded the grasshopper file with internalised geometry. Thanks in advance!

is this what you’re after?

Yes, you are amazing! thanks!

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