Jan,
If you're still looking for the Challenger Hemicab, a gal in south Florida now owns it. Her collection is online.
www.stylesgarage.com will take you to it.
I've been trying to research more of this hemicab's Swedish history for her. According to Peter Jordan, the bloke that imported the car to the UK from Sweden, it was deemed a "pizza racer" while in Sweden (i.e. a car raced by a pizza delivery shop owner).
Perhaps we can do a knowledge transfer. PM me if you get this.
-Brian