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@Emyr
Doing maths...
Fat CAAD runs Si arms on a 160mm spindle through a 120mm BB30 shell, with a ~9mm offset spidering for a 71mm chainline on a 197mm TA rear.
With a 160mm spindle, a BSA30 BB and a 100mm BSA shell, I'm going to attempt a 65mm-ish chainline, probably by using an AI (+6mm offset rear vs normal) flat-ish spidering.