Yes, you can use a spot weld cutter to separate the pieces. Cut thru the thinner metal. I'm assuming you're trying to replace the body panels with new, since you're talking about removing them from the core support. If you'd like advice about repair (maybe weld to good metal on those panels in lieu of cutting them off), post some pictures of what you're dealing with. I'm sure that someone will help out.


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.