Grant: I used a single sheet of 3/4" MDF, about 16oz of Resin, 4 cup holders and scrap carpet from the shop, cushion from CC. Mind you I work for CC so, I got the cushion at cost so, I'm into it for about $170.
Cup holders are completely separate from the sub boxes. I put a separate chamber just for the cup holders so, they are not part of the 1.5 cu. foot sub chamber.
No Slip Gator Grip www.wakejunky.com