I still love this cake design. I have made it in a single tier version (see it here and here) and now this is the two tier version. I made the cake topper the same way as the oter cakes. I designed an airplane cutter set (purchase here) and just customized the colors to match this color scheme. You can catch the airplane topper tutorial here. I used my standard car cutter to make the line of cars, but I also have a groovy car cutter available. To make the windows on the cars I hand cut some white fondant and glued them on with some water or tylose glue. All the tires were cut out of black fondant with a small round piping tip and attached the same way. I designed a train cutter to use for the front car. The rest of the train cars are just hand cut out of matching fondant. The clouds were cut using my fluffy cloud cutter. I cut all the pieces including the airplane topper ahead of time. When it was time to assemble the cake it all came together really quickly. Happy 3rd Birthday Shmuel!