Just one on the chainstay, the other M6 hole will be attached to the seatstay.
Ooof you are going all out. I do like that solution, I've seen it on a couple frames and it looks very neat and smart
Crack Pipe Brake Mount.
Yellow lines represent my current considerations. I am not sure the crack pipe will be strong enough without some triangulation/support/bracing.
It's gotta be the hardest and most error prone way to get a brake mount on a frame though.
I guess the crack-pipe bit on this one is to move caliper forward so that the seat stay doesn't get in the way of caliper adjustment.
@PhilDAS started
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Just one on the chainstay, the other M6 hole will be attached to the seatstay.