Its good to see you doing more yourself! You spent alot on having things put in earlier. Can make huge savings just doing everything yourself. Yeah for sure! I used 4 or 5 bulk dynamat boxes on my install and could probably of used a 6th with doing the roof if i had my time again. The other thing is going around removing trims and packing foam/rubber underneath them, as no amount of deadener can stop the little rattles.