No, what I have seen a couple of outfitters, they use the regular way, no sideways. I guess the 4-in thick partition wall is needed for mounting accessories like plumbing or electrical outlets.I'm curious -- is the outfitter using standard replacement for 2 x 4 stud? If so, are they turning it sideways so that the walls are not unnecessarily thick? Or, is there something like a 2 x 2 stud that's available in metal? That'll definitely would be lighter, but would seem to limit flexibility (of use).