Thanks. We love it and it's worked so well here that I wouldn't change a thing - well, except maybe add another panel next summer, but we'll see!
We bought the heaviest ml (and I can't remember what that number was right off the top of my head) clear plastic Lowe's had in stock. If you click on "My Coop" under my avatar and scroll down through quite a ways down, there are some photos and descriptions of how we put the plastic on for winter.
Because we used the lattice over the top as a spacer between the chicken wire covering the cattle panels and the plastic, we didn't have any ripping or shredding with the weather. We were able to remove it in just three pieces (not easy, but we did it!) and put it away for this season. The piece that went over the top was the easiest to get down because we hadn't had to "fit" it". The piece on the south side was easy, too. The section on the north side was a little trickier because we had to cut a curve into it and also fit it around the door.
Amazon has a clear plastic that is reinforced with mesh and we seriously thought about getting some of that, but ours is still in such good shape that I hate to spend the money if we don't need it. I dunno - we're still kicking it around.