The driver's side rocker panel area was just as rusty as the passenger side, so off it came too.
You might be wondering why the body isn't sagging with the rockers gone and the top not in place. The dolly that Greg Soter put together does a good job of holding the car from its natural suspension points.
The main reason the body doesn't sag, however, is that it weighs very little with no running gear and nearly all of the exterior panels removed!