Unfortunately, building mass produced, light weight vehicles just don't mix with 'cost effective'. Look at what GM did with the C6 ZO6 to get it as close to 3100 lbs as possible... balsa wood/carbon fiber floors, carbon fiber fenders and wheel houses, aluminum frame and magnesium cradle, etc. Basically using every trick they could come up with for a mass produced car.
As much as I'd like to see the Camaro coming in in the low to mid 3k lb range, I just don't see it happening AND staying reasonably priced.
Oh, and I agree, we can build our own versions of what we want. That's why we're all here on this site.
