i don't have dimensions for the box......because the smugglers box is the box.....sorta......
there is a divider under where the top board splits (in the center just next to the sub), plus some sylicon(sp?lol)........
this sealed off the steering rack/ventalation things.....still able to service anything in there.
under the sub i simply sealed up all openings to make it airtight......then i used chunks of wood to "eat up" airspace to get the volume to the subs specs........
the goal was minimum weight, amps in the nose for ballast, i only added about 20-25 lbs total.....but i DID lose alot more from the A/C removal