No, if properly repaired it is just as safe as new.
Yes, it could may mean the car is not safe to drive, have it checked/repaired by a good garage.
Yes you can it, there is only one way to do it and that is by sand blasting the frame then self primer.
your transmission needs repaired
Depends on the car front wheel drive it a cradle rear wheel drive it a sub frame.
Yes. Go to a body shop that has a frame straightener.
Repairs and replacement of the top are normally done with the frame on the car.
It is not legal to drive a car without a windshield in this state.
No. have exhaust checked/repaired
If your car won't drive over 5 miles an hour, it needs to be repaired.
Yes, it is legal.
no there is no legal age to buy a car there is a legal age to drive though
You should not drive the car until the brakes are repaired.