Hi,
I actually covered my coop and part of my run with washers and wood screws (like you used to attach your hardware cloth) and some of the poly solar sheets with the waffle edge that are clear but with some sun shading capability that come in different lengths that you could probably figure out something from either your roof line to fence line or any thing you wanted, just keep in mind drainage. Some are better quality and won't discolor so whatever your pocketbook dictates. You can drill right thru the stuff. I suppose you could use a rubber washer if you really were looking for it to be water tight. Of course, I am in Fl, so I don't have issues with expansion or contraction either, but these pieces although you can get them in different lengths, they are not that wide and have to be overlapped. I hope this makes sense! They are kind of floppy so I would think you would have to frame out something to stabilize it.
Good luck!
Orchidchick