The Chaos Dwarf Cauldron of Blood is the extremely out-of-print resin model produced by the Armorcast company. Clean lines and really gorgeous paint job done
with an airbrush. It has a cannon on it, so it could certainly be fielded as an Earthshaker Cannon, as a Hellcannon, or using the rules for the Empire Steam Tank.
Not shown with a crew because it was not supplied with a crew by Armorcast. You will have to borrow 3 models from one of your other units to crew this monster.