First: Sorry, I mixed up the Predator (Missile) with the Jaggernaut (Advanced Howitzer). My Fault. On Page 4 of this thread I have placed some posts about the Assembly Plant. The Assembly Plant is a unique building of the German Empire which replaces the Factory. It allows to turn 4 citizens into Engineer instead of 2 citizens (Factory). Of course I'm able to build the Assembly Plant. But unfortunately I'm not able to build either a Battleship or a Jaggernaut. Both Units require the Factory to be availabe for building them. Maybe they have not been mapped to the Assembly Plant so far. For your understanding: I'm researching Future Technologies now. That means that I really should be able to build those units now. I'm suggesting to verify that the Factory and the Assembly Plant are required for the same units/buildings.