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Excellent thanks.
Thinking about this a bit, many manufacturers strengthen the frame by putting a support between the chainstay and seatstay to stop frame flex, eg on the Surly Straggler.
Admittedly the Straggler has the brake mounted to the seatstay.Is the section with the brake going to be substantial enough to avoid flexing or, if alloy, worse still snapping under the breaking forces. The other concern I might have is regarding wheel movement. Unless I misunderstand the above photos you are planning to use a through axle in an adapter on the inside of the track ends. The only bit passing through the track ends will be the axle to the clamp on the outside. I believe that with the brake located above and to the front the brake force will send the wheel up and forwards, but I could be wrong. If correct this would result in the axle slipping forwards and lose of chain tension.
I have a bolt through skewer on a disc bike's front wheel and have been disappointed with it. On a number of occasions it has vibrated loose. None of my normal QRs I've had in the last 20 years ever did. I'm going to try a DT Swiss RWS version and see if it improves.
Cranky-
yes aluminium frame is a big unknown. Will get interesting later!
Wheel movement will be up and towards rear if any. When I used the pompetamine dropouts normally (before sliding dropout conversion) I never had slip on the disc side (sometimes on drive side without a tensioner) with a m6 bolt-on axle.
svenhöek
I used this drawing with a 160mm adapter from shimano/bike24 + a picture of a dolan track end (+ some rough "photo mapping"/ matching scales )
This is the specs for flat mount calipers