Some Concept Cars

[jugs]

Flying Car
http://www.youtube.com/watch?v=EHXnLCIgNug&feature=related

Underwater Car (skip the first 2m 30sec)
http://www.youtube.com/watch?v=6E4q7p6R3Og&feature=related

Plastic Car
http://www.youtube.com/watch?v=WGWZ9veQ54E&feature=related

 

[madkayaker]

plastic car will save on the welding