Thanks! There is a little bit of hangover on the opposite side so I will go and trim It tomorrow.
I got the nylon rip stop from Amazon. Just some generic stuff. The company was supposed to ship me 1 square yard of it, but it seems I got 2, which was a godsend because I barely had enough! The grommets were 3/8in ones I got from Michaels. I also learned that when working with nylon, if you try to pull out that little string hanging off the side, you will ruin the entire...freaking...sheet. And, to prevent said event from occurring again, you should "heat treat" the edge of the fabric. Just run a lighter up and down the edges until they solidify a bit. I also learned (after i cut it) that you can cut this stuff with a soldering iron, so it gets heat treated AND cut in one process. Ah. The good 'ol Internet.