Try Ely at Ruth Bag Works. He will make a bag to your specs and is generally up for new, interesting projects:
RuthWorks SF
Good luck!
Originally Posted by
downwinded
Those look like well made bags. I'm sure they would have no trouble constructing what I have in mind. Dill Pickel Gear also has an example of something that's leaning in the direction of what I described. While it's a quality bag, I'm sure, the Arkel is still a fair bit larger than what I really am looking for. At that price point, I may as well get exactly what I "think" I want.