Thanks for all the help you guys have been with this install. Equipment list is as follows:
Head Unit - Kenwood Excelon KDC X396
Amplifier - Boston Acoustics GTA 1105
Front Speakers - JBL GTO608
Rear Speakers - Bravox CF 5-1/4"
Subwoofers - 2 x DXI104 DVC
My son and I started the sub box this weekend. It will house both subs, amp and door speaker crossovers. I wanted a low profile design so that my son could still carry his stuff around w/o a big speaker box in the way. Box is constructed from 3/4" MDF and will have 2 4" PPI flared ports. Box volume (1/5 ft^3) and port size (4" x 12") were based on Polk recommendation for the ported box.
Sorry about the picture sizes.
Wish I had a circle jig for my router!
Test fitting the amp and cross-overs