Update: Painted pictures uploaded! This is my Thunder Clash add-on kit for Battle Core Optimus Prime - I really liked the Reprolabel set and I decided to add some additional firepower to the Cannon Master. The kit contains a new head sculpt, set of arm cannons and a backpack that serves as a turret in truck mode. A pair of shoulder panels are optional. I am also planning his "big gun" and stage II of the arm cannons (can't have enough of them ya?) The turret/backpack is designed to fit snugly over Optimus's combiner head - so I don't think this will fit on Motormaster. Back view of the backpack - the two cannons are attached using c-joints and they are very tight with WSF. Truck mode: I must confess that the two arm cannons does NOT fit tightly on the roof. But in final product I added two tabs on each side of the turret so you can attach all four of them in truck mode. Back of the truck: Armed-up super truck: I am really happy with this set, put a lot of thoughts to the details too. Hope you'll enjoy it. Thanks!