The info may have been in the earlier thread, but weren't they composite bodies. I think it was Cycolac( or something similar), later became known as ABS(?) plastic. Used in a lot of bike fairings but the several car models, including the AMT (model car company) Piranha that was seen in some of the old "Get Smart" series, never seemed to get anywhere.
If they were produced, would the aluminum ones then be considered less desirable
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