From the Porsche archival photos I see here and have seen elsewhere, there appear to be different bucks for different aspects of the coach work.
For instance, one type of buck for fabrication of the panels and another different one for joining/welding the small panels into large ones. The previous photos seem to show both of these two types.
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Kent
http://www.tinmantech.com
"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.
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