@ScientistSmithYT The information is out there, you just have to piece it together. A lot a scientists worked on it for years. The different groups published papers on their parts of the process. Like this one about fabricating the coils.
An induction cooktop has a high frequency power source that is applied to a coil. I was wondering if you could take the high frequency electronics from a cooktop or even buy / design a high frequency power source and instead of a coil take a 50 or 200 foot long wire and attach to rebar to heat it...