Plymouth's next show car took a different twist — it was a station wagon. Unlike many of the more impractical show cars, most of the unique items on this one found their way into production. Designed by Dave Scott, the "Plainsman" started life as a "coupe de ville"-type town car. At Exner's suggestion, Scott modified the design to create a station wagon (wagons were becoming big business at Chrysler). First sketched in February 1954, the order…