I would think you can… but it’s a lot of work, which is why a lot of modders won’t attempt it. Things like Animation and AI(this probably being the biggest hurdle) are just two of the things that need to be done from scratch.
And AI in this game from what I’ve heard can be sketchy, especially if you try altering existing ones with the little understanding most people have due to no documentation on the changes Wildcard have made to the engine.
-WM