Classic Cadillac by GM designer Charles Stewart - 1968. (via (1) Allthesketches.com) More car design here.
Propeller bus on skis, of course.
1958 Kaiser Waimea - an all-aluminum concept car designed by Rhys Miller under the direction of Frank Hershey. Kaiser had no intention of re-entering the auto market but wanted to expand it's aluminum market and sell aluminum in industrial-size quantities. This and the other all-aluminum concept cars developed were never meant for production but were to be used for promotion of aluminum. But how Googie is this?!