Here he is, my transformable Optimus Prime. I never thought I could build this and have it turn out so well. The problem I had was getting it to look decent in both truck and robot form. The arms actually fold out from the side of the cab. The legs have to be removed and repositioned for the transformation. But I think it works. The head and hands are from my other Prime model. He comes with his trailer. The door opens to let Roller out to explore. The sides also fold down, like the G1 toy. I think it turned into some kind of weapons platform. Unfortunately, I haven't built anything inside it yet.