I'm using these techniques. Couple of points... Foaming chassis voids cuts down on noise drasticaly and adds very little weight. Removing the heavy tar like sound deadeing and replacing it with padding that is adhered well to the panel reduces weight and maintains ample noise control. Someone really needs to mass produce the power steering and alternator brackets out of alu, they are super heavy. A simple cast alu piece would be perfect and easy to produce.
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