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If you have the GDSII mask art then a CAD program can be easiest. Chip is good to go (scaling consistency w/ package cavity drawing, known pad center cords, these also want to be right).

Where is your cavity drawing coming from?

I usually have to recapture from PDFs that the package vendor supplied, in the CAD tool that I'm using (open source or Brand X).

A "hand shop" will probably be more forgiving of discrepancies in numbers and sketch-y drawings. One that is all auto-bonders needs more correct and complete.