I just ordered a Rockford P1S410 10" sub for my 09 Scab. R-F recommends a .59 cu. ft box which should be pretty easy based on the commercially available 04-08 boxes like SupercrewSound.com. Show me what you've done! Looks like us 09 owners don't need the big notch to clear the driveshaft tunnel since our floors are flatter. I'm considering just making something full width and adding space for the amp on the other side.