As I've had many years to consider what makes a bad sling bag, I've been able to design a great sling bag for both photo and video producers. If you're a bag or sporting goods manufacturer in the Seattle area, or you have a relationship with one, I'd love to collaborate with you to make this bag a reality. Whether you want to buy the design outright or truly collaborate on it, I'm ready to fund the creation of prototypes. Photographers and videographers deserve a sling bag that's truly designed around how they work, commute and create, one that adapts to them and gets out of their way.
As soon as I realized how the upright on the Ellie interfered with my battery door, I was able to devise a cheap solution for manufacture: a small bracket that would accept the rails and to attach the upright with truncated rails, aka screws, forward of the current position. I proposed the question to @3leggedthing's Twitter account, only to get, "we can't design a specific bracket for every camera and configuration I'm afraid."