Aluminum vs Steel?
It's not always an obvious savings.
In the case of certain parts - such as bumper or door beams the savings are not always significant.
Keep in mind that although aluminum weighs less for the same volume as steel, the aluminum part may need to be thicker or heavier to make up for the loss of strength.
Some of these new high-strength steel alloys are pretty remarkable and may even be lighter than the aluminum counterparts because you can use thinner cross-sections, etc.
Of course, there's always titanium (weighs similar to aluminum, but with the strength of steel) and carbon fiber.
It might be interesting for someone to offer carbon fiber structural components for various NSX parts (bumper beams, door beams, etc). They would have to be really engineered well, but at least you wouldn't need exotic, hard tooling to make them.
-Jim
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1992 NSX Red/Blk 5 spd #0330
1991 NSX Blk/Blk Auto #3070 (Sold)
1974 Vette 454 4 spd Wht/Blk
Looking for 76-79 Honda Accords