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Here's how I do it.
https://www.backyardchickens.com/a/small-coop-tutorial
About halfway down the page.
I used waterproof weather-stripping strips in the crack where my hinged lid meets the stationary part of the nest box roofing and it has been working great for me.
Is that hard to make work? Every time I have done it on my house it falls off in a month or two. But that is at the top of the doors, not the hinge side. And just for air not water.
Water does not want to flow "uphill". With extremely high winds you may get some water in under there but I've never had a wet nest box, and the wind blows at my house 355 days a year rain, shine, or snow.
The other thing that really helps is to put the nest box on the sides of the coop and carry the roof over the edge by 4" or so, that means that most of the water will fall on the middle to end of the nest box roof/hatch/lid thing.