I knew I wanted to make this cake for my brother for his birthday for several months now! At first, I thought I might have been too ambitious but it wasn't as difficult as I imagined. I should've made the bottom tier 3 layers and I should've allowed the antennas to dry a few days earlier but all in all, I'm quite happy with the results.
The cake was made of 2 8-inch lemon cakes with raspberry buttercream frosting and 2 6-inch red velvet cakes with cheesecake mousse filling and vanilla buttercream frosting. I used a mix of Duff brand buttercream fondant and homemade marshmallow fondant to cover and detail the cakes. Adding tylose powder to the store bought fondant did not speed up the drying process. It did work wonders on the homemade fondant though.
The toothpicks actually kept the antennas from bending over and by the evening, they were finally dry enough to stand up on their own. Tylo glue was my best friend. It held up the pieces through the entire 45 mins drive without a hitch.
I couldn't make this cake without incorporating the autobot logo somewhere, so I attached it to the back. I used the good ole pumpkin carving technique to get an exact replica of the image.