Check out this YouTube video of the Highwire in action! The Highwire is a hydrogen powered concept vehicle with steering wheel controls suitable for the Playstation generation.

Check out at 3:35 min how the cabin can be removed from the drivetrain and engine components platform, so conceivably there could be alternative cabin modules you could buy (or rent) for your vehicle, so one day you could drive a sedan, and the next a convertible, and the next a pickup truck!

[UPDATE (11-9-06):  Direct YouTube video below.]