Wire Routing for Courtesy Light Switch - 72 Blazer

[Green Monster]

I was recently lurking under my dash and I found evidence indicating the courtesy lights on my 72 Blazer were added on by a previous owner. I'm under the impression that this was a factory option with some trucks, Blazers, and Suburbans.

The wiring appears to have been routed incorrectly. The wires in the cabin go to the switch at the "A" pillar from under the dash. The problem is that the wires were ran through the kick panel vent door openings. This method looks to be the fastest and easiest route to the switch. It is not clean looking and puts the wires at risk of damage. I would like to correct this. When installed properly, what is the correct routing for the courtesy lights to the switch at the door?

-John