Well, if you don't mind painting you can use artist canvas, they will go much larger than 54". Downside is getting it nice and smooth. There was a post earlier about someone using canvas "dropcloth" from Home Depot, check the thread about pictures of DIY screens. I don't know how thick regular screens are, but you could always buy the one from ebay and mount it with porch screen spline, the same way many(including myself) have done with the blackout cloth. I ran into the same problem when I was making mine, so I comprimised and went with a 72" wide screen and blackout cloth on sale at JoAnnes. Good luck.