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The mounting surfaces weren't level. I guess the stay must have twisted slightly while I was trying to tack it in place. Solved with some careful filing, basically just faced the mount. However I also got the dimensions wrong from the dropout so it's actually between a 140 and a 160 rotor. I've got a 140 in there at the moment and it grabs enough of the disc to be useful but not a long term solution. I think I'd just try to find some 10mm spacers rather than the usual 20 and go up to a 160 rear.
I also ran out of cable stops so the rear gear cable is cable tied in place after exiting the downtube for now. And the frame has no seat or chainstay bridges. I'm going to ride it and see how it feels but it will be getting both eventually anyway for fenders. And at some point paint.
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