If anything, it's the finish of the tutorial that's a little, shall we say, sketchy? When writing it, this last step was really hard to photograph. So I took a couple more shots this time.
Except even though I 'get' my method, and it works fine for me, my friend Marci of Marci Girl Designs came up with an alternate method that I think will be more straight-forward for many of you. And though others hinted at "turning through the main lining," Marci graciously documented each step with terrific photos, and yes, I think you should give her method a try. In fact I did on this pouch, and it worked great.
Though I didn't catch that I should have sewn just 'up to' the last zipper, not clear on over. If I had, I wouldn't have ended up with rounded corners. So do yourself a favor and check out Marci's Alternate Ending Tutorial and you'll see what I mean. She explains it all so well, and I'm confident you'll have a finish you'll be pleased with. "Live and learn" they say. I'm happy to do both.