My brother screwed up this time

Fixing the frame structure on a car that has a "real" frame isn't that hard. I've replaced whole rails, and straightened out cars that were hit so hard the frame was 6" shorter than before the hit. Clipping, replacing rails or even entire sections of box frame cars can be done with great results even with serious damage. The trueness of the car depends only on the box frame, and that's as simple as replacing sections of rectangular tubing. Granted, making sure it all ends up in the right place is a little time consuming.

Unibody cars are not that simple. The trueness and integrity of the car depends on the entire structure, not just the rails. If there's damage behind the firewall or ahead of the rear axle, it won't be the same again. And I'm not a fan of "pulling" a car back out.

The problem is that the damaged sections don't change, the undamaged sections do. Steel work hardens as you bend it, so, if you put a big wrinkle in a panel, then pull that panel back by pulling on the ends, you don't fix the wrinkle so much as you stretch the undamaged metal to put the ends in the right place. It's just not the same. Maybe when all is said and done the suspension points end up in the right places, but the integrity of what's between those points is not the same as it was.

Yes, you can go back and replace everything. And its true, nothing is really too far gone to be fixed anymore with the parts and resources that are out there now. Anyone that's seen some of the rebuilds on the hemi cars out there can attest to that. But, those are basically "money is no object" builds. If this Duster is really bent, it could easily cost twice as much as the car is worth to get it straight, doing it the right way.