I am also interested in this topic and have been pursuing much research. I am looking at the world at war ability as its 100% possible and seeing how I can adapt it to work with bo3... so far... not good XD but I am not giving up on this one. I will let you know when I have cracked it. I am on the official mod tools discord if you want to help.
[UPDATE]: I have found this tutorial and I am seeing what this matey can offer: [You are not allowed to view external links. Register or Login to see them]