Hey guys, need a straight forward box design for (2) Sundown SA-15 dual 4 subs. Will be powered hopefully by a Skar or Sundown 1500 Watter. Max dimensions are 37wX34dX25h. Goin in a 2001 Olds Bravada. I built a box before so I learned a little. So not looking for an outrageous box, just something basic. Subs up port back? Subs up port up? Also will be putting in a false floor.