Jonathan, i have a 2003 F 150 and i'm thinking of making a speaker box on both lower door panels. They have a plastic pouch on the bottom of the panel. I'm planning on cutting the pouch off and making the box over it. Would i want to cut the plastic back to the door metal and use the inside of the door as the encloser or should i make a wood backing for the speaker box? I'm planning on putting another set of components in them. I already have a midbass up high in the doors. Thanks.