You can get Columbus chainstays which are specifically shaped for brazing on flat mount caliper mounts - SLF114OV450SX, SLF114OV450DX for the driveside.
Alternatively, Paragon make dropouts with flat mount bits you can braze onto the NDS chainstay (DR2071 in steel for QR rear end - Ceeway sell them). Or you could use Paragon Polydrops with a flat mount insert.
Or you can make it standard and then braze some flat mount caliper mounts directly onto and into the chainstay. It's a lot of work but I think it looks best. This was my recent effort:
Hi. Planning a build myself and was looking at this flat mount solution. Can I ask what spec chain stays you went with for this? There seem to be some disc specific ones from Columbus that we double butted with a thicker wall at the tail for the disc loads, but they’re pretty chunky things. All the other tubes I’ve seen are single butted. Is that OK? Prefer the aesthetics of the slender tubes. Thanks.
Those were Columbus Max chainstays, so still pretty chunky at the BB end. They've survived doing Vienna to Barcelona, so they seem up to the job.
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