Sean, here are some up close picts. So the top and bottom pieces that get sewn to the zipper coil get sewn upside down, then folded over and sewn again. The width of the front portion of the pouch must be bigger than the back piece. The extra slack of the width is taken up, and folded over and sewn so eventually it is the same width as the back. I tried to show this in the picts.
Newton- went with the Rainshed coarse polyester netting Weight/sq yd: 4.3 oz, stay rod is 6061 aluminum, tubular, via Mr. Swihart. I do carry a flat Platy, but the pockets were designed for poweraide/Gatoraide/smartwater bottles. Thanks for noticing all the raw seam allowances are covered by cross grain. I went through an entire spool of DIY Gutter Tex 50 on 2 packs, stitching it McHale style, actually, I got the Dyneema straight from Dan himself- Thanks Dan!