I bought some steel angle brackets from Wal-mart, and I plan to bolt/screw into the rear deck from below. The box will extend to the rear to about 1" from the trunk light. Also, it seems there are two layers of sheet metal toward the rear of the shelf with about an inch of space in between, so that will aid in mounting.
I will attach to the box using T-nuts. I will use plenty of brackets, because this thing weights about 35 lbs! But I believe it will hold the weight with no problems.
I got it all assembled tonight, and gave it a test run. It sounds awesome. The sound is exactly what I was wanting (great SQ). I am driving it with a JBL 150.1 amp. Now all I have to do is figure out how I am going to hold it in place while I attach it. *sigh*
