Historic Hen / Brooder Houses Shed-Style Roof (esp. 1930’s & 1940's)

There’s a certain style of brooder/hen house that I’d like to build, with a single shed-style roof, so that the back wall is shorter than the front. Here are a collection of similar examples for reference.

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Not exactly the same style, but interesting:

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[via] That one’s nice because it provides a floor plan!

Based on my research, it looks like this was one of the basic styles for a chicken or brooder house up until about World War II, or sometime in the 1940’s. Haven’t found any real definitive timeline for any of this, just piecing it together…