My next step is to make something like your fixture. It would be a lot easier if I bent my own stays. Pre-bent sbend stays aren't meant to be that far out where they have to be to hit the front of the dropouts. This is good for tire clearance and bad for crank clearance. It's too bad nobody none of the U.S. suppliers got the columbus low mount stays.

And I'm also set on using a lugged bottom bracket shell. I'm not actually worried about the connection with the dropouts. I need to prove to myself that the stays will give me the tire clearance I want while leaving crank clearance