Super Mario Kart Wedding Cake

Couple decided that for their wedding, they will have a Super Mario Kart wedding cake! The groom says, "We were looking for ideas to make our wedding different and our own. My wife suggested the idea of having a video game cake after we saw one online. Coincidentally, the latest Mario Kart game was released on the same weekend of our wedding. This cake was designed with elements from multiple Mario Kart games, as well as a few aspects from other Super Mario Bros. games." Here's a preliminary sketch of the cake.