This was one of my favorites to do so far. Cake base is plywood, measuring 20"x24". This thing weighed a ton! Wheels are styrofoam covered in MMF. Undercarriage is painted wood, which was screwed down to the base. The truck is all cake covered in MMF. They're 8" square cakes stacked and carved on top. Chocolate cake with oreo cookies 'n cream filling.