Don't like the interior of the Challenger? Tired of people giving you a hard time about how much it weighs? They're now selling the body in white. 5500 + Freight. When I ran the calculator the freight was about a grand. So....all you need then is a chassis, some seats, a drivetrain, fuel system, engine, suspension etc.
If you weld up a tube frame.....
http://www.allusasupercenter.com/Dod..._p/almts27.htm