I would be curious if the inner roof skin could be separated to repair the structure and restore the crown. I bet the inner skin could be reglued to the foam and secured with rivets.
Alternatively, with the skin removed, the foam could be removed also, and sound deadening strips added to the inside of the outer skin. lf the inner skin were secured using rivets, a series of holes could be drilled, through which a low expanding spray foam could be injected.
You might then have quietest and warmest roof of us all. Or this might be the craziest idea ever dreampt up.
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