Quarter panels, let's cut em off and put new ones on.

I did this with my Duster (my first ever attempt at body work).
A few things I learned.

• I really didn't need to replace the entire quarter panel. I really think I would have been better off cutting more manageable patch panels.
  
• Be prepared for more rot underneath
• A good spot weld cutter is invaluable
• Getting the panel to fit good at the door jam will be your biggest challenge.
• Rather than trying to butt the panels together get a flange tool and to flange the old sheet metal (where possible) so that the new panel can lay on it. I did one side of my car this way. I feel that it yielded a better result
  
• Stich weld.... Weld hot enough that you dont bead up too much on top of the metal. This will save you when it comes time to clean up the seam.