I for one would settle for an amphibian/submarine car.
B_Bob/elhigh — The lead picture in Permalink #51 is based on a spherical octahedron that has been prolated different amounts in different directions. IOW it's an asymmetrical zepplin. Consequently it can be scaled from belly tanker to motorhome size of variable fineness ratio. And it lends itself to formless construction.
here it is as a motor home:
With a lifting body and air-breathing plasma jets, it would fly.