I think you are attempting to re-invent the wheel. If only shade is what's wanted, a Kelty "Noah's Tarp" or etc., with a couple of poles and some stakes or sand anchors will serve. Pitch it over the entry to your tent, and be happy. If you want more shaded or rain sheltered area, you'll want a quality tarp, at least two adjustable height poles (four, better), a bunch of stakes or sand anchors,and lots of line to rig a proper tarp setup, and some knowledge of useful knots. REI has some of the products you'll want, including Kelty tarps, poles, stakes and anchors, polyester line in various sizes, even a knot guide, etc. So far as I can tell, the best of rain/shade tarps are made by Cooke's Custom Sewing ---for best shade, choose 1.9 oz. silnylon fabric, in a dark color.