The vinyl siding (maybe double it if it needs to be stiffer) sounds hopeful. I don’t know what it would cost but a sheet metal shop could shear some strips of stainless steel and punch holes for the screws if it’s too hard to drill - I’ve seen stainless that was impossible to drill and some that wasn’t bad - the shop would know.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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