Do we have such magnet technology? Putting aside cool demonstrations, any practical application would necessitate field strength of electromagnets. Thus superconductors, which are currently a pipe dream.

EXOTIC METAL ALLOY OR SILICONE SEMICONDUCTOR THERMOCOUPLES ARE DIFFICULT TO MANUFACTURE IN GARAGE CONDITIONS -- YOU NEED A SUPPLY CHAIN

TWO CONDUCTING PLATES AND SOME MAGNETS IS A WAY MORE WORKABLE PROPOSITION

At this scale, and especially if you're avoiding 'engineered' materials, I'd be quite surprised if you were able to cover the power inputs alone, much less output power with any level of efficiency, even if you only wanted to refine the cesium or sodium or whatever that you're using. Now if you were using this as a topping cycle for something that had a forced intake, things might be different.