Caught this programme on National Geographic for the first time earlier in the week but I think it was released last year. It goes into detail on everything related to making the Bugatti Veyron, featuring everything from segments about individual parts like the gearbox, brakes, tyres, rear spoiler, etc. to the factory and how the car is assembled (including the Volkswagen test track). The factory (shown in part four) is nearly as impressive as the car.