[PaulD]

Best stuff for sound insulation is dynamat xtreme .... but it comes at a price.

The only thing that seems to "wow" people is prodigious levels of bass, so don't worry too much about it.

The best place to put midrange/tweeter speakers is in the kickpanel area. Start by aiming them at the back of the radio ... then work from there. Do not put speakers in the back .... they mostly just mess up the image. Lets face it, how many time do you REALLY have more than one passenger anyway ?

You wrote a novel so it's hard to address everything. Try reading thru the newbie thread, there's lots of good info on there - including an equipment rating list.