How to hole structure? In grashopper

I need to hole my surface in grashopper so people can go inside…This structure is panel crosing, almost completed…Just need to find solution to trim surface along curves (arcs). How to do it?! I prefer not to internalise all data, so you can see and understand better the project. Also because I couldnt understand which part is usless…

(upload://8dgMMaMvUfYGAjFaSoLkvavhx7s.png) (63.5 KB)Superfice.3dm (303.6 KB)

Please internalise all data in grasshopper file before posting it.

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