Looking for 4 15" blow thru design ideas . all input appreciated ~

[Savag3]

Looking to do a blow thru in my dodge dakota . going with four RD.Alpha/PSI 15" hybrids on a RD d9 @ .5ohm . looking to target at around 30-32hz ~ looking for some ideas on designs thanxall in advance ~
pic of tha Dak :http://i71.photobucket.com/albums/i125/shyoop/100_0526.jpg

[surreal]

If you get T/S specs for the woofers Id be happy to do a design for you.