I did my gps navi antenna somewhat similar to how f5 does.
Antenna in the back center, run the wire along the gap between the rubber and the roof when the rear door is open. Tucked under the plastic piece above the tail light on the drivers side, came across and tucked right into the moldings at the headliner. Went all the way to the drivers a-pillar that way, then went down to the kick, and to the stereo.
I did try several other routes and the fit and finish as you said, did make it harder. There is enough play in the headliner to tuck a wire into the plastic side pieces though for sure.
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