Scott, looks great. Wish I had a "made-to-fit" solution for my 09 like you guys with the 11+'s do!
For anyone in this thread who wants to see similar placement on a pre-'11 WRX, here's the one I recently did. I used a light from a UK-market Evo VIII:
btw, I just wired it completely seperate, on its own circuit, with a Hella switch on the left side of the dash near the mirror controls. Since I like my front fogs on even on clear nights (for a bit of extra visibility...and I like my yellow bulbs, lol), I didn't want to link the rear to the fronts. Also, I just ran the wire though a small hole I drilled in the spare tire well, then up into the side-body interior paneling in the trunk....then along the rockers with the main wiring loom up to the dash kick panel.
btw, Virginia motor vehicle law in the says that rear fogs must be brighter than the regular tail-lights (e.g. brightness of the brake lights)