If you have never clicked on the box in the upper left corner of the page, I highly encourage you to do so. It is sometimes information overload but incredibly educational. Pick a box, dive in,be educated, pick another box, and so on.
Check out this nugget I copied from there, as I was shocked by the 2nd sentence and had to reread it.
Chevrolet Assembly - Front Sheet Metal Subassembly
All the color-painted exterior front sheet metal panels, plus the black-primed radiator support, inner fenders, and center grille support and the low-bake painted grille were conveyed to the sheet metal assembly area; all were in "Broadcast" sequence, matching the sequence of bodies on the main assembly line. Option holes for engine emblems, antennas, Vigilite housings, nameplates and moldings were pierced in large hydraulic fender piercing fixtures before the fenders were placed in the assembly fixtures.
So I guess it’s ok to punch out a hole in a perfectly good painted fender. Who knew.