The way I read it was that guests will be able to design the look of the car (colors, decals, rims, maybe some tech things, etc.) and then ride a test vehicle to get physical statistics. Then, after it's over, they'll kind of combine the two aspects with a cool little video showing an awesome-looking car with some realistic stats. This would be similar to the new Spaceship Earth, where they take you picture (appearance) then ask you the questions (statistics) and you end up with a neat clip to email to yourself.