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A very good point....
I'm convinced that downtube external routing is too ugly so that will have to go inside, but I'm fairly relaxed about external chainstay routing...
As far as I can see, the options are:- Thru DT - thru T47 BB - thru CS
- Out of the DT - under the BB - back into CS
- Out of the DT - under the BB - outside the CS
Given your good point on the weatherproofing of the DT - CS concept above I think I'm inclined toward internal DT/external CS.
- Thru DT - thru T47 BB - thru CS
Back to the back brake routing question, this looks like quite a simple/elegant solution to route past a BSA BB