Well the best way is to drill out the spot welds using a removal tool, but since you say you can't get to them I guess that is out. You have to be VERY careful when working with sheet metal, it tares way easy!! And then you will have patch panels to do.
Are you sure you can't get to the welds? Have you taken a piece of sand paper to the area and looked for a little circle (spot weld)? Most all spot welds on brackets like you mentioned are viewable and drillable.
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Tony
'68 Camaro
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