This was for my son's 4 yr birthday. A 2 tier, topsy turvy, train cake. My first attempt at topsy turvy (I learned a lot of do's and dont's) but it was fun! Bottom layer is 8" mocha chocolate peanut butter cake iced with SMBC. Top layer is 6" vanilla oreo cake iced with SMBC. Primary colored fondant decorations were bought but white and chocolate fondant are MFF. Used topsy turvy tutorial from here but left sides of cake straight. I had a difficult time smoothing the icing when it was stacked. Should've spent more time on that. Any suggestions? This is definitely NOT my cleanest work but I'm very pleased with the overall cake. Like I said I learned a lot! I couldn't keep all the wires from spinning and leaning into the icing? Any suggestions on this? Thanks for looking and thanks for any tips or tricks! In the end all that mattered was that my son LOVED it!!! :-)