I will totally be copying you Bruce. Hope you don't mind!!!
I don't mind a bit!
One thing you've got to account for is the depth of the female plug. I chose the location above the back edge of the rear passenger door because there was enough room between the roof and the headliner for the 3 inches or so of housing and then the bend in the wires--there was a bit of a pocket in the roof reinforcements that allowed the female end to slide in without pushing down the headliner. Is your CB antenna hole in the center of the roof? If so, you might have trouble getting it to fit.
Oh yeah, I also liked using the trailer wire hookup because it made wiring the relays, switches and all that real easy. Just wrote down what color wires were getting connected to each set of lights on the rack, then used the same color wires in the engine bay when connecting to the relays. Pretty simple--even for a color blind guy like me (my 8 year old helped on a few occasions
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Good luck--feel free to ask if you need more details.
Bruce