I use that website for the most part but instead of using scrap pieces of ABS for the snap plates I used canvas doubled up with good old E-6000 glue. I'm sure webbing would work the same. My thinking was that most of the armor has curves where you want to attach a snap and having a cloth like base contours to the natural shape inside the armor and gives you more gluing area. The E-6000 gets into the fabric and creates a fiberglass like patch. Best part is if the snap wears our you can just peal up a corner of the canvas base and cut the glue off with a little effort. Not something you can do with the ABS method using ABS glue.
Just my 2 cents worth!