Step 1:

Acquire a human skeleton and a skeleton horse. For this prop, we used two store bought props and combined them together to make a sideshow act.

Step 2:

We unscrewed the skeleton just above the pelvis, and removed the horse neck and head from the horse skeleton. Then, we joined the two pieces by zip tying them together.

Step 3 (Optional):

To add more to our centaur, we used a wig that we had to give him some hair, and to add to his side show act.

We have a tutorial for a Circus Wagon, which can be used with the Centaur.