Originally Posted by
howieleem
But if I do that how do I spec the crank so that the chain line is correct??
Your frame has nothing to do with determining what length bottom bracket spindle you need. Spindle length is dictated by cranks choice.
Select whatever single speed or track crank set you like. The manufacturer of that crank will indicate in their literature what length spindle to use in order to achieve a ~42mm chain line.