With a box like the one shown above you would lose more room than if you just built one out of 3/4" mdf... Take some measurements of the space that you do have behind your seat (height, width, bottom depth, top depth) and I'm sure someone can help you design a nice mdf box. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
B That is not my box it is the one I was going to use as a reference to make mine. As for the measurements I will get some together sometime and post them up and see maybe what someone can come up with. The reason I want to use fiberglass is because I want to learn how to do it and make it look different than anything else around here.
Man ,,,,twelves are gonna take alot of space out your truck if you do that in a regular cab. Why not just do a wedge shape and leave a cutout in the middle to mount your amp on?