We made our own magnum Nwinds about 8 years ago and they are still going strong. We started with the heavy Tyvek that they use on houses. We scrounged a bunch of leftover rolls from contractors and then ended up buying one 9'x?' roll. We made about 150 dekes, but we went with a larger pattern, 24"x36". They really stick out and it doesn't seem to take as much wind to make them look normal. The other nice thing is that they aren't so erratic in heavy wind. We have yet to master the stake and head, though. We used cut-out plywood and masonite for heads. Have fun making them, we did.