Scarab would be nice, but its already being done as an expensive all alluminum replica so, I do not think it would be done;
http://www.scarab-motorsports.com/specifications.php
So it would have to be something that someone would be willing to pay more for, something already on the market and (I think) something that was originally aluminum - that their trademark.
So, what cars of that era were originally in aluminum that would fit the bill of interest with a price from 60 to 100k but yet is streetable?