http://tdh.prop-planet.com/viewtopic.php?topic=5019&forum=6
This thread offers some other ideas, including my own. Also, check out Seeker's custom rig. If I ever redo mine, I'm doing it HIS way!
Mine works great for mid- to heavier-weight packs. It distributes most of the weight down to the hips and waist, instead of the shoulders.
Let us know if you need any more help!