umm do you have a jigsaw? if so just go buy a bunch of fine metal bits last time I needed 3 so you may wanna get 4. I used a dremel to smooth the edges and fiberglassed new 5 1/4" speaker mounts but if you properly build the sub box to point up through there you can just build speaker mounts off of the box.


Check out this guys profile, he did what I'm doin to, it look s100% pimpish.
http://www.sounddomain.com/ride/377626