The Loudspeaker Design Cookbook has some good information about designing drivers from the ground up and some of the software that goes into it. It goes over, albeit possibly not as in depth as you'd like, selecting driver materials, how many turns and layers the VC needs to be, touches on coating the VC to increase heat dissipation and power handling, an other things that go into driver design.
Acoustic Elegance might be worth contacting, although don't expect an overly hasty response since they're usually pretty busy, but they design and build all their drivers in house and might be able to give you some of the information you're looking for. TLSguy is also a great resource if you want to PM him.