Here is a concept for a weatherproof, through-wall, 4mm bullet connector to simplify motor connections and eliminate molex connectors. The operating principle is when the nut is tightened, it compresses the o-rings around the outside of the female connectors. I’m not sure when I will have time to work on this so I wanted to throw it out there in case someone else is interested. This requires test printing for tolerances and functional testing.
https://www.printables.com/model/333170-4mm-bullet-connector-work-in-progress
https://imgur.com/a/OgWNKmf
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Beautiful!! 
Thank you ever so much for sharing! 
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