That seems like a good way to go with it New, 1/2" exterior plywood, a 4x8 sheet would do both sides to two ft height. If your yard sells less than full sheets you could get a 2ft rip for the front. A 4ft 2x4 ripped in two, and cut at 2ft would give you 4 2x2 for your corners, just use decking screws to hold it together. At that height(2ft) with those 2x2 corners at the back should be rigid enough to not need a cross member. If you run a 2x2 all around the top it would stay straighter too.
You could use self tapping metal screws(3/16 to 1/4in hex head or torx) to anchor the front and sides to the frame(probly about 4 or 5 on each side rail, top and bottom, would secure it). You'll still need to drill through before you run the tapping screws in. That would secure it, but still be removable( then when you want it back on just use the same holes, same screws etc)
Everytime I look back at the photo I see something different. I thought it was channels too but it's all angles. Screws wouldn't work well, they'd be sticking out the other side, little 3/16 or 1/4 inch bolts would still work ok tho
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