Wheelwright Restorations (Ray) has reproduced the rear corners, and the lower panel from the door to the rear fender that is usually toast. Correct curves and contours.
I think sandblasting has its place, but environmental concerns about the lead dust contamination that results will make it much more costly. In addition, there are many areas where rust is embedded that are difficult to blast. Northwest trucks really need the full dunking if the rust is a concern. I'm budgeting for the Redi-Strip on my '54 since I don't believe I can effectively reach the areas between panels. Costly, but effective.