being in the airport business, I made the start of one fron aircraft grade Alunimum. It was to be adjustable for length, deep fletch cover and solid enough to hang a variety of pouches/ bags on. It is light but solid. never did finish it as I started using a side quiver. For stickly hunting with light gear they are tops. I had trouble getting arrows in behind my back. Unlike your pics, my broadheads were down, might have to try it with them pointed up-if I can do that safely.
I still have one of Jerry's quivers in the garage too. I liked the idea of the cat quiver and they do hang nicely on a transport pack for serious backpacking.