This is the Chaos Siege Cannon.
Now, this is one rude bugger of a cannon, since its some sort of beast chained to a wooden platform, forced to shoot cannon balls out its rectum!
Rating: 7 This was actually manufactured by GW waayy back when. It is a chaos dwarf machinery of destruction and should have 2 or 3 little crew guys i think. You can check it out at stuff of legends.