thanks again,
I'm using something from rockford fosgate called the 3sixty.1 here's the link: http://www.rockfordfosgate.com/products/product_details.asp?cat_id=1&series_id=49&family_i d=50&item_id=106185&locale=en_US&p_status=[/URL]

It will let me take the signal from the head unit sum up all of the cut frequency's and process them via a laptop add on program so that I can send a clean pre-amp out signal to my aftermarket amps. The cool thing about this thing is I can adjust the levels of each individual speaker via a laptop....pretty cool....

As far as the enclosure goes, I've made up my mind to go with MDF, I'm actually creating a template for the front cover while I'm writing this. The spot I am referring to is the plastic piece located under the floor cover that is held in by 2 plastic 10mm nuts. I plan on making a flange on the bottom of the front face of the enclosure and drilling a couple of hole to utilize the bolt posts that come out of the chassis. I'm guessing these along with the two bolts at the top (the ones that hold the fuse box on the pass side) should be enough to secure the box. I'll let you know how the mock-up I'm currently making works out. Will send pics if it works , when its done....