This is an order from Alicia for her son who wanted a bus cake for his birthday. I was thinking of using square styrofoam to build the square bus shape or to mould the whole bus using fondant. But I gave up the second idea as it will be too heavy for the cake and it may dent in. Therefore, I looked for a square box and wrapped it up in fondant instead which is lighter for the cake. The final product turns out well!