I am not a DIY type, but, after hearing numerous systems that use ancient Western Electric 713 drivers, I finally put the money down on a pair of 713b drivers. Fortunately for me, my speakers have no baffle/enclosure for the midrange, so it will be pretty easy to physically integrate this driver in my system. I know some people who can help with the crossover.
This will be an interesting, albeit expensive, project. But, I have not heard ANY currently manufactured speakers that I like as much as the custom systems I've listened to recently that use some pretty old drivers. I recently got to hear a system that uses an old, 13" Jensen field coil driver as the only driver and was surprised at the dynamic, realistic and enjoyable the sound that this ancient driver can deliver. However, this driver is even more difficult to obtain than the Western Electric driver I am getting.