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I think my gear ratio is 44:17 maybe 16 have changed the rear few times , sourcing another crank could be cheaper but the tools for pedal taps do go fairly cheap plus it's not too difficult as the holes are already drilled and you'll have the tools for other builds (there will be more believe me) I would certainly check what SS said about the left hand thread it's an easy mistake to make,
dirac
Squaredisk
littleK
Don't know how much shops charge but you can have the cranks rethreaded some do it to french cranks so as to take English threads, your bike is looking good added pic of my BSA cheap as chips but I love it..