It's huge, it's loud, and it's a centerpiece for any visitors to your home: a nuclear reactor! Moving rods, spinning turbines, and stands as a reasonable (if simplified) example of how a nuclear reactor would work. Once it's up, you can add all sorts of lights and embellishments to tie it into the surrounding builds, and while it doesn't produce actual power, nothing in the vanilla game uses power anyway! So it's win-win, really.
As with other Mumbo Jumbo builds, he walks players carefully through the steps to reproduce the important parts (in this case, the rods and turbine). From there, it's up to the individual builder how to make it look great in