The TL that I'm working on currently has the CSA giving up slaves by 1900 via industrialization. I'm trying to make it (or force it) to be as realistic as possible and not ASB at all. I've got a map, and the idea for a flag that works off of combining the Bonnie Blue and the Third National.
There was a fairly interesting thread on Confederate Industrialization. Pretty much all Confederacy threads tend to degenerate into generic shouting matches. But this one managed to stay on topic for a while, and there were some interesting notions bandied back and forth.
Ultimately, I don't think that the thread went into enough specific detail to effectively model the trajectories and evolutions of various industries and infrastructure, but there's enough there to get you thinking and allow you to follow up and develop your own ideas.
No link, sorry, but it's worth hunting around for.