Wetherbee, I like your ideas above in general terms, but I think for this project I'm just making a different bag than the one you have in mind.
It probably makes most sense to think of this project as I've envisioned it as a more of a "keyboard brief," which incidentally has what we can perhaps call a nod to tactical-bag aesthetics rather than a full-on, hard-core, mil-spec bag for carrying on assassination missions. I renamed the thread accordingly to avoid confusion.
Really, the concept grew out of my love for the soft briefcases made by Jack Spade (basically, metrosexual man-bags) but in response to my frustration that their briefcases aren't quite right for carrying around keyboards to meet-ups and working outside of the home (wrong size/proportions, no padding, scratchy interior zipper pulls, often no closable interior pockets for small parts or tools). But I'm also into Goruck bags and the more or less minimalist black-centric style seen in a lot of tactical gear. So this bag is a sort of hybrid of those concerns and aesthetics on my part, and a response to my own singular quirks and desires in a bag. I've added things in response to community requests, such as the MOLLE number pad bag option, but ultimately this is still it's pretty much just the bag I wanted for myself. It sounds like yours would look different and be something different, and that's cool. Maybe that's the one I can I make next. ;) Or, better yet, I'd be happy to help you look into making one of your own and offering it up to the community. For better or worse, I've learned a lot about bag prototyping, sourcing, and manufacture over the past many months—though, alas, mostly of it has been to observe how annoyingly hard and expensive it is. =\