hey im building a box for 4 12'' alpine Swr-1241D and my plan for the box was to make a wall like box with the 4 subs in a square formation and facing the back of my JEEP and the back of the box facint the front of the truck so the back of the box is right behind the front seats. My idea was to put plexiglass ont he back side so you can see the baskets and magnets, how thick should the plexiglass be , each sub will have its own chamber of about 1.45ft^3