You can make this carousel by placing the rotating base horizontally right on top of of the oval basement piece. It also requires less frames to make than the wheel. Rotating base is hexagonal, and there are three seats, but the set has only 2 figurines. So one seat will be empty, unless you use a passenger from another set.
![Magformers Carnival Carousel Magformers Carnival Carousel](https://buildkitpedia.com/wp-content/uploads/2023/08/mags-carnival.jpg)