That is absolutely fantastic! I don't think I'd have the patience necessary to do a 1:12. You've achievd a superb result.
F1 cars were proper motors in the 70's, they all looked so different and look at the size of those gumball rear tyres! Adhesion was provided more by mechanical grip of the tyre/suspension combo than by the aero package of todays F1 that does nothing for overtaking.