Firetruck for my sons 4th birthday. We tried to decorate it as close to the truck that his dad drives. Butter yellow cake with buttercream filling and covered in buttercream. The cab is a 6 inch square, 1 inch walk through space. The back of the truck was 10 inches. Used fondant accents: ladder, light bar, headlights, grill, rear lights watergun on top, windows. The wheels are fondant covered styrofoam. We cut out slits of the cake board for wheels to fit up in. The cake is sitting up off the bottom board on a wrapped piece of wood to keep the truck very stable.