I don't have any frame building experience but I think it would be a ballache to do it yourself. You would need to borrow a jig as well as the brazing gear to make sure everything is aligned correctly.
It seems a shame to rebuild half of a 50 year old frame to fit new parts if it isn't damaged. It might be cheaper overall to invest in a more modern frame. Depends how attached to the frame you are!
I don't have any frame building experience but I think it would be a ballache to do it yourself. You would need to borrow a jig as well as the brazing gear to make sure everything is aligned correctly.
It seems a shame to rebuild half of a 50 year old frame to fit new parts if it isn't damaged. It might be cheaper overall to invest in a more modern frame. Depends how attached to the frame you are!
Dan