There's a gap between: 1) reinforcing the whole car for a rally (which brings the car up to 1965 overengineered standards, and well beyond); and 2) simply wel

There's a gap between: 1) reinforcing the whole car for a rally (which brings the car up to 1965 overengineered standards, and well beyond); and 2) simply welding two halves of a car together. If you were to weld two halves of a car together, and weld a ton of reinforcements into the unibody, it would very obviously work fine.