I think I would approach that by removing the interior panels. That can be done by drilling out the spot welds. That would give you access to deal with the rust by media blasting, which will probably reveal additional thin spots that will need to be dealt with.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.