Hi Hank.
You get a lot of sun down there (I have family near Shady Grove & 301), but even at that, the cover you have is likely opaque as far as the plants are concerned. Your eye adjusts; chlorophyll doesn't.
My suggestion would be to cover the frame with clear plastic (if you can find a scrap of UV-resistant greenhouse film, that would be better than drop-cloth film), then cover that with the shade cloth.
I don't think the sides would be necessary unless you're planning on having plants close the the outer edges of the cover. Early-, and late-day rays are significantly reduced in intensity. You might consider low-light plants toward the middle and high-light plants toward the edges.
Plants grown outdoors WILL be more prone to insect issues, so be prepared to be diligent, and to do several thorough pesticide treatments before bringing them back in come autumn.
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