... The idea was that GM would create this standard "autonomous" platform, using a compact hydrogen fuel cell for power and electric drive motors mounted in the wheels, and then just attach any number of different lightweight bodies to it. All the steering and braking would be accomplished through "drive-by-wire" electronic controls, and everything could be packaged within in the six-inch-thick floor, such that the skateboard would operate completely independently. If this sounds a lot like a body-on-frame rolling chassis from the pre-war era of automotive manufacture, well, you've got the right idea.
