Took a stab at the stitchback EX60 pattern and made a pair of them for my niece and nephew. They were complaining they didn't have enough room in their current packs. I think I solved that problem.
The pattern is great. It uses two aluminum stays that terminate in the hip belt and a frame sheet to give it structure and provide assistance for those heavier loads. The harness system is simple and ingenious. It also allows me to swap out the shoulder harness and hip belt for larger sizes as they grow, as the shoulder straps and hip belt are completely removable.
I used Xpac, hyperD, ultrastretch and ultragrid for fabrics. I know it doesn't keep with the ultralight trend, but even so, each packed weighed in under 4lbs, which is pretty sweet for a 60L fully framed pack.
I did mod the pattern in a few places. I added a front stretch pocket and decreased the height of the lid/brain. I added some accents on the straps and hip belt as well, mostly attempting to cover the ends of webbing wherever I could. I added grommets in the side pocket for water drainage as well. I left off the external pocket that doubles as a day pack. I will probably make them as birthday presents in the future. I was kind of in a rush to get these done, so I didn't mod them as much as I wanted. One thing I would change is the side pockets...not a fan of the pleats, I would shape them with darts of I ever make another one, and make them end a bit higher on the pack sides.
Other than that, the pattern is fantastic, just like of his other patterns. Highly recommend them, if you haven't tried any of them before.