just a chime in on one i did a while back:
don't cut the kick panels. mount the speakers under the dash where you can not see on either side. dont use a housing, just the small screen like you see on rear tray mounts. there is room to put a couple of bolts and they stay up pretty good. i also put a couple under the rear seat facing the front seats behind the vinyl. you think they might be muffled but they sound really good and you don't know where the sound comes from. natually if you are one of those guys that tries to make a car sound as good as a home unit. you might not like. but no rattles, not buzing etc. sounds good to these old ears. just a suggestion on hidding. My amfm is located in the glove box. the am is hooked up to the am speaker for the orginal feel. open the glove box crank it up. when you are driving.