I'll be watching this project as well. I will be doing some front deck work soon and potentially some areas on my floor, near the i/o cover hinges...
My gut says your transom is wet too - especially from the transom storage box garboard tubes.. At least thats where my transom was rotted from. I had two i/o's, redid the transom and converted it to one i/o.
If I were you. I would also look to fortify, add stringers etc to high load areas to really strengthen things - hey! you'll be there anyway, might as well make it tighter than new !
As for the wiper motors - are they hard to come by ? I replaced mine 12 years ago with (2) new AFI stainless ones like that - work well enough ( marginally so )
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