The box setup is fine, if not a tad twitchy when it comes to steering. That was my experience anyway.
Also try to avoid using the outer most shock holes on both the rear and front shock towers. Using the outer holes puts a lot of stress on the towers. I've noticed a slight fracture on my front towers since I started using the outer holes to stand them up more. It may be better to use a rear shock tower on the front as they are bit firmer.
Ask defMondo, he has been using the rear tower on the front for some time.