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I would be surprised if it didn't utilize something far out there like a completely CF chassi-frame. It would take quite the investment probably, but in terms of the future it would probably pay off better than titanium, which will remain hard to work with and expensive, whereas with CF you can probably get the economy of scale going a little better. I would reason to bet that a titanium frame would just not be economical in any regards, even at the level of the NSX. Titanium is not that light for it's volume, just that you can use less of it due to it being stronger, but you have to work the diameters correctly for enough stiffness. Again, I think CF would win out given modern advances in CF and where it's at in general automotive/aerospace/aviation.
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