Definitely a five-star mod. Exceptional detail and quality, especially the physics and handling.
I can't imagine the Countach would be an easy car to do physics for. There's a lot of weight-shift and a fairly soft chassis to deal with, and old tyres as well. All of which this mod delivers. It feels mid engined, it feels quite heavy, and there's a very noticeable feeling of slip in fast corners.
A must-have.
It is a hard car to get the sound right for as there are close to none useful sound files to sample from - KitKat is doing his best, and for what he has available to him I believe he is doing a great job, but me and him both agree that there is room for improvement, and as you stated, it is rather difficult with these limitations.
Hopefully we will get to record a real Countach one day!