art>model>graveyard i think. it might have a weird name but check under the grave yard. u can just copy the field. make sure u change the death animation and other values like that to the correct ones. u can find the death animation by click on the unit and going to the viewer on the left and clicking the arrow to change to death animation. it'll tell u the time right above the viewer.
The factory model is under spells, I believe. I think it's either the stand or an alternate stand for the Pocket Factory projectile. Don't quote me there, though.
The factory is a unit... you have to change the model of the factory and then change the field inside the spell so that it spawns your "Graveyard" factory.