[deluXE]

Any idea why there is an aluminium bonnet and a steel boot lid ? I would have thought these two items have similar functions and stability requirements or am I missing something?

Weight distribution purposes. Much of a car's weight is distributed to the front of the car, due to the weight of the engine. To balance the car, it's common for heavier steel parts to be fitted to the rear, while lighter aluminium parts are fitted toward the front.