Eventually finished my Lego car after many hours. Really chuffed with myself as struggled with some pieces due to arthritis in hands. Tweezers did help when I was able to get them onto my fingers. The instruction book was quite thick and quite comprehensive so you cannot really go wrong.
Doors open and close. Steering wheel works. Mirrors adjust. When moving the car you can see the pistons going up and down.
I would say that Lego must really have some very, very clever designers for these toys.