OK, just a thought for those that like the bird bath hood but don't like the water issue.

My 49 has a rain gutter under the hood that is designed to catch most of the water that gets under its hood, and dumps that water to both sides. Might not be hard to fabricate something on the 72-93 cabs to drain the water run off towards an area it won't cause a problem when you open the hood. The only think I can't remember is how far away from the cab the hood moves as its lifted open. might to too far away by the time the bird bath empties.

Posted are a couple pics of the rain getter under the hood. Its the straight piece that runs side to side.