Your not going to like my answer, maybe someone has a better way. This is what I do. I bake 2 11x13's, freeze them, stack and start carving. Your going to need 4 for 2 vehicles. I fill them with enough batter that they are super full. As for the 2 tone, I hope you have an air-brush. If not, go ahead and do one color fondant, then the other. You can add detail such as pin striping at the seam. Hope this helps some.