Simple plan, easy to construc and usefull.
Well usefullness is strictly a matter of personal opinion. ☺ A porch swing or rockers are fun, relaxing and welcoming, at least in my opinion. Here are a number of options, and there are many more out there if you want or need them.
Any chair can be a swing. I attached clumbing straps to the front of the chair and the back. I clipped all 4 straps together and then hung it from a stand.
19 Free Adirondack Chair Plans You Can DIY Today - The Spruce Crafts
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