Doctor, let us know how it works. Which way will your baffles run? Lengthwise baffles sewn to nylon with polyester thread resulted in the thread breaking as the fabric stretched. Some have used zig-zag stitching to allow for stretch, but others (whom I consider knowledgeable) don't like zig-zag. With your heavier polyester, stretching shouldn't be a problem. That leaves the question of shifting down if the tubes slope too much. I'm trying to come up with a pattern of baffles that keeps them all horizontal - sort of like contour plowing.