Well, I feel like an idiot. Apparently the extra 7" (which may actually be 6") and 2" (which may actually be 1 1/2") is for the trim (there was never any trim installed). This is a common design in my area/region (Seattle/Washington/Northwest). All I have to do is drill in my 2" x 6"'s and call it a day. Thank the lawd!
Think you could post a couple of pics?
Do you want it your way or the right way?