Very cool. Really digging it. I love my Porter, but I always keep toying around with the idea of having Chris do something up for me.
Is the hipbelt removable? It looks like it is in the photos, but I can't tell completely. If so, that's a great feature choice. I'd worry about that hipbelt for heavier loads (doesn't look stiff enough to me), but for lighter ones, it would be ideal. Either way, if it works, you're set. If not, you always have options to swap it out.