Won't the 6m x 6m thing have something to do with the size of the loom machines. You could try and find a curtain manufacturer for details on such matters. The curtains at a theatre are huge but I bet they are stitched together.
You may well be right on the loom size, just thought it might be worth an ask.
Sounds like a good project Mark, does it involve your equestrian shooting?
Lol, was it that obvious![]()
I got hold of some 3m x 3m canvas dust sheets, about £12 each and got a couple sewn together as I wanted a natural canvas background. They paint well and at reasonable F stops and focal length they render awesome.
Have you tried backdrops.us. I have had smaller ones painted( you can't wash them) but they have been priced ok for my needs