How do i make a custom car-chassis system? (not a-chassis)

Hey there, I am currently working on a racing/driving game and I want to make my own chassis, however I have no idea on how to start, I tried to look through a-chassis for maybe a bit of help however I got completly lost. I also could not find any tutorials on it. I want the chassis script to contain information such as top speed, accelaration, horsepower/watts, torque,weight and maybe in the future g-force

any help is appriciated