Personally, I LOVE the wagon style. Always have, but I didn't like the narrow track or wimpy front fenders compared to the sedan.
Realistically, this guy rolled and pulled his way far beyond the additional 10mm track width of the sedan, on each fender. Remember, he stuffed 18x10's underneath this thing. That's hard to do even on a sedan. A wagon with sedan fenders would have to roll about half to three quarters of an inch on the rear fenders to make things work with a smaller wheel. This guy easily pulled a full inch or more. Look at the sharp edge.
I'd be happy with a 9" wide wheel all the way around and the pull necessary to make it happen. Even an 8.5" would be sufficient. I'd rather have more tire than wheel onboard.
Quote me now while I'm feeling good about it. I've decided a WRX will be the vehicle that replaces the Jeep. I can't see paying Evo prices or justifying purchasing a halfassed/beat to death example for the same asinine amount of money. For an affordable, point to point, all-weather capable performance car, a wagon fits the bill. A swapped wagon, even better.