well, the columbus gravel chainstays are back in stock at framebuilder supply. I stared at that drawing for 15 minutes and I don't understand how the brake mounting area could possibly be parallel to the disc. I saw a picture of them on facebook, but I haven't found it yet.

If I did direct mount, I'm not sure what dropouts I would use.

I ordered the chainstays and the brake mount. Have to figure out what dropouts to use. I think the drawings must not be to scale?