I've been working on this guide for about 2 weeks now, and I finally finished it.
It is really long, but that is mostly because I put pretty big pictures in it to help out.
I posted about the pack a week or so ago, but I had my first chance to use it the other day. Put about 15 lbs into it and went for a hike for about 4 hours with my dad. Ended up doing a decent bit of off trail stuff and scrambling/sliding up and down rocks, and the pack carried well even through those environments.
Hopefully some people out there will find the guide helpful. I plan on doing another one in the future on a much more simple, SUL type pack as well, and I'll post dimensions of my planned 40L version of the pack on my blog soon also.