Thanks, Glen, for the suggestion on the plastic bags - I hadn't thought of that, but it serves a dual purpose of getting the covers on easier and maybe a little bit of built-in waterproofing. But maybe crinkly noisy... ?
Carol - I heard there was a person locally who would make cushions but, well, I guess I like a challenge. I thought, "How hard could it be??" Let's start with the first point being that I don't really sew...! I do, however, have a sewing machine and I did make a "test" cushion to see if I could really do it. Much to my - and hubby's - amazement, the cushion actually turned out. Yes, it involved watching YouTube videos and reading a book or two on how to make box cushions - not to mention the sewing machine manual on how to work the thing - but I got there. So now I'm kind of keen to do the rest of the cushions.