Thanks to @Kyuubeey, now the car have a brand new physics!
Now car simulates the behaviour of the Hydrolastic system, the original suspension system you'll find on most Mk1 minis. There is some cool magic on rear trailing arms too, simulating flex of bushings in cornering.
Tweaks on tires too, and vintage road tires added.
Some final tweaks to interior materials, UVs and lights.