you would sound deaden the roof by using dynamat or some other sound deadening material. you would most likely just have to remove the headliner to get access to the roof. put your deadening material onto the metal of the roof and then put your headliner back on. shouldnt be too difficult.
as far as the rear view mirror goes, the rules may apply differently from state to state. i know here in texas, you dont have to have a rear view mirror as long as you have your side mirrors. also, you can get rid of your side mirrors as long as you have your rear view mirror. but thats here in texas, i would check out the rules in your state just to verify
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