You don't have to make the panel stick out very far from the door. If you want to creat an encloser for the speakers here is what you will do. Depending on what kind of car you have you should have an opening in the inner door skin. (the sheat metal right behing the door panel) You need to check the clearence of how much room you have between the door skin and when window when it is down. Then you will mask off the opening and prep it for glassing. Next you will build you speaker baffles and secure them to the door panel. Next put your door panel back on the door. Then you will glass inside the door panel and the area you masked off making sure that you glass it to the door panel. Once it cures you pop off the panel which will have you enclosre attached to it. Next you glass your door panel, and you know what to do from there.