Im actually in the process of building a box and enclosure right now:
Picked up a sheet of 3/4 MDF at lowes yesterday, have about 7/8 of the box done, just putting on a last piece, then routing out the circle for the sub and getting it wrapped up and siliconed.
It is a downfiring sealed 10" w/ 425 watts, on a 5" tall stand, in total it will be 15" tall in the back, with .78 cubic feet to match the sub. Mounted behind the driver's seat as most of these are (No one wille ver use the jumpseat behidn me, so I may as well remove it)
Power will be ran up through one of the three bolt holes from the jumper seat, audio cables snaked under the carpet - and completely bolted down so no one can carry it off.. will take 2 people to secure it properly on top, and below.
I'll take some pictures once its nearly done.. jsut not in the mood to be snapping pictures every 10 minutes while Im working - takes too much tiuem away from the project