I'm currently building one for 12's..it'll have the pass thru in the center.
If you need to know how much it stick out right now take a tape measure and drop it straight down from the rear deck...not the very far up wehere it comes down(doesn't allow for the 16" height) and then measure 12 inches out from that point.
EDIT: It'll probably be a pain in the ass to get in...might even have to jack the car up to get the weight off of the strut towers to get it in. Maybe ill shorten in to 35" so that way i know it will fit and plus i can get some dynamat or second skin on the strut towers if i want.