When you create your faction, there is no option to pick a Robot/Battle Droid culture. I have scoured through these forums and found out you can create factorys and produce Battle Droids. It does ruin the immersion where I'm trying to ressurect the CIS, starting off with an army of HK-Series and IG-Series Droids; using them to conquer a planet then from there creating legions of Battle Droid armies... however all of my armies are not that, I have to pick another culture; like I said earlier, that really breaks my immersion of restorring the CIS.