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No worries re tubeless vs seamless. It's all good. Is the crank going to be drilled disks / loose shaft and pins / loctite or pinned joints, or cut from solid?
One further thought - cutting studs from threaded rod and using scale nuts (smaller hex a/f size than normal machine screw nuts for a given thread) is usually far lower cost than buying hex head screws. Also more typical of what was used for fastenings on the real machines from 1865-1940 ish time period.