Recently I have begun building an Imperator Titan for use in my games of Adeptus Titanicus. To use the model in games, I have taken the rules written by Kylan Day (a member of the excellent ADEPTUS TITANICUS 2018 facebook page), and I have tweaked them slightly, mostly in order to simplify them slightly for myself.
In Kylan's version, the Reactor management for the Imperator was slightly more complex (as befits such a behemoth), but I prefer a simpler method of playing, and so I have changed the Reactor management back to how a regular Titan works - albeit with a far higher number of Reactor levels, to reflect the gargantuan power generators on such a colossal Engine.
I have also played about with the strengths of the weapons a little bit, and dded points values.
So - thank you Kylan for the inspiration and for putting the rules out there for us all to use.
You can find the Terminal for the Imperator Titan here: