There is no plywood immediately under the aluminum. A typical wall area is Aluminum, sprayed on foam, then the inside wall which is plywood (1/2" I think) The plywood is riveted to the inside of the wall "studs" or bows.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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