On my 1984 Dodge Rampage the cabin air intake is directly under a grill at the trailing edge if the hood. The intake hole itself is surrounded by a sheet metal 'wall', and the rain is kept out by a plastic shield which sits an inch above the opening and extends an inch over the sides and stops an inch from the bottom of the 'wall' -a sort of umbrella. Simple and effective.
PS You're an inspiration!
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