I severely doubt there would be slavery for another 40 years in the CSA, 150 is unthinkable. The amount of international pressure would have been to large, not to mention the economy would have had to evolve as the North's did and that means a supplanting of the cotton-slave based economy with a more industrial one.
I just think the whole structure of the CSA was doomed to fail, as someone said before...thier whole country was founded on STATES rights and seceeding whenever you had a disagreement. What would have stopped Texas, or Florida, or Kentucky from seceeding when the CSA ran into some rough patches in the first few decades?
I love the whole gray thing though, very stylish.