I get one side like I like it, then I fold it over and mark and cut the other side.
At this point getting the stitch line right is very important. After you glue and stitch one up, the sander or grinder will make the edges nice and square.
Hey Toney, I'm going to try it. I'd been going to do it anyway but now you convinced me as to how easy it would be. I need to get the snap tools first though. I've made a Kydex already and it wasn't bad at all.