jgoss, in replacing the rear wings, or any structural member, it is critical to keep the tub supported to prevent it from sagging. As more rotten metal is removed the sagging potential increases. It is best to work on one side at a time. For the rear wings I placed the panel up to the wing, scribed a line where it was to fit and cut off the rotten wing aprox 1 inch below. I then cut out the rotten outer aspect of the inner wheel well using the wheel well replacement panel as a guide. Welded in the outer wheel well. Refit the outer wing making the exact cut for it to be butt welded or if you wish leave enough metal to form a flange to lap weld. The wings were not fitted until the outer and inner rockers and floors were replaced, and the door gaps were determined to be satisfactory. Continue to use the door gaps as confirmation that the tub has not sagged. The rear wing replacement panel wraps around to form the lower portion of the door jam. If this is where you have the "Swiss cheese" it will be fixed with the panel. I used a spot welder for the rockers and any other area where I could reach and mig welded everything else, both butt weld as well as punch fill welds where needed. These panels will distort if the welding gets them too hot. I essentially placed hundreds of tack welds working back and forth from each end of the panel to keep the metal as cool as possible, then stitched little 1/2" to 3/4" welds between. Again don't rush let the metal stay as cool as possible. Good luck, Rick /ubbthreads/images/graemlins/smile.gif