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Looks ace, what is the reason for dropped chainstays from the bb?
On the assumption that the rear brake hose is threaded through the BB shell, which it certainly appears to be, the dropped chainstays might also make it easier to thread the rear brake hose through the BB shell, past the bottom bracket and into the NDS chainstay. It can be done on a T47 BB even with a 30mm spindle (which this bike obviously doesn't have) but it's tight even with a BB for a 24mm axle chainset.
Saffronspokes
Brommers
Looks ace, what is the reason for dropped chainstays from the bb?