[Lockleaf]

I would be a bit cautious using zip ties. It doesn't take a whole lot of time before the plastic they are made of grows brittle and snaps under constant movement. Upholstery pulls against its frame quite a bit. For security of your work just buy a set of hog ring pliers at harbor freight or a similar store. Hog ring is the name of the metal rings holding upholstery on. Most upholstery shops will sell you a bunch for a couple of dollars and then you can finish it the way professionals do. I tend to believe they have a reason for continuing to use the metal rings in what they do.