I was also worried about the drilling holes part in the Krown rustprooing process, but after a lot of reasearch I could not find even one comlaint that the holes started to rust or any other problems related to them.
The holes are not big, and are drilled with a special tool, not a drill bit (not sure if all Krown places use it), the tool basically is designed just to drill through the sheet metal and has a stop mechanism that prevents the drill hitting the finish once the tool goes through. It's very neat and you don't have to worry that they will damage stuff behind sheet metal, like wires and such.
Also, all the plastic plugs are greased.
The holes are not big, and are drilled with a special tool, not a drill bit (not sure if all Krown places use it), the tool basically is designed just to drill through the sheet metal and has a stop mechanism that prevents the drill hitting the finish once the tool goes through. It's very neat and you don't have to worry that they will damage stuff behind sheet metal, like wires and such.
Also, all the plastic plugs are greased.
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