Need some help for new defined F1

[cotharyus]

Making the body higher off the ground isn't really going to help with it falling through the road. As far as the bottom dragging on some courses, that's pretty much standard for F1 - which is why the FIA mandates "legality planks" under the car, to force a certain ride height to be maintained. The planks can accept a certain amount of wear before the car is disqualified from the results of a race, and many teams tend to put the car as low as they can and use what wear can be accepted.