I think those hour estimates are way too low, based on what I see; in 1967, a 'panel replacement' was based on collision damage, not rust. Removing, preparing the adjoining surfaces, etc when rust (esp heavy rust as Kerr's car) is very time consuming comparied to simply cutting off a damaged panel and replacing with straight metal. Any good shop will provide their costs/invoices showing hours; surely someone here who has had rusty panels replaced can provide some 'real world' hourly estimates. Another good thing to do would be to *ask the fella providing the $/hr estimate, for his 'hours estimate'. If he can't provide at least a rough estimate of the time, it indicates to me that he's never done this same type of job before.
Kerr: 175 hrs is a bit over 4 man weeks; or 2 guys for 2 weeks. Do you think all your rusty panels could be removed and adjacent panels derusted and preserved, new panels adjusted, welded in and prepared for paint in 2 weeks by 2 guys? I really don't think so based on what I see get accomplished in such shops.