I believe the projected cost figures in the $3-$4K range are for complete rollers, presumably with gearboxes. Only guesses for what a tub would cost.
CF is expensive, but the labor and equipment costs are very high. Big autoclave and laser pattern cutter for starters. Lots of time for design and R&D to meet crash testing standards.
The IRL is currently running about $25M in the red. They have expressed no desire or ability to get into the race car manufacturing business, and would probably make a mess of the job anyway.
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