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The square tube is acting as a gusset. Plates would be stronger I suppose. To my backyard engineering skill, it seems plenty stiff. But I'm open to ideas.
Trim coil is used to go over wood trim on houses. It's PVC coated soft aluminum. Unlike flashing, it's thicker and when you bend it, it holds it's shape better. It's also rated to be outside in the sun/exposure/temperature changes.
I anticipate some expansion along the long dimensions, but I'm not all that concerned about a little rippling. I plan to rivet the joints all the way along them as well as use the adhesive.
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