Sometimes you've seen something a couple of times, but you don't know the name of it. That can make searching for that thing on the Internet rather difficult when all you have is, 'arch-roofed shed with board frame often used for sailboats but also for regular sheds and greenhouses'.
Fortunately, my google-fu is strong! It's called a 'Bow-Roof Shed' and you can buy plans and a construction manual from Stimson Marine. https://www.by-the-sea.com/stimsonmarine/bowroof.html
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