well, just look up diamagnetism and pyrolytic carbon

it wouldn't be that hard to build this thing, and i'm suggesting to use silver wire for the tesla coil circuits because they have very high conductivity, much higher than copper.

i'd guess that with a decade and scraping around in stone age conditions i could put together a decent blast furnace and forge silver wire and cast iron (which is very high carbon steel) and i can think of ways to make insulative materials out of natural materials, resins and such, using heat and acids and bases, and yes how to make bases... idk...

to be honest i've not thought through the process of how i would go about being able to manufacture this kind of hardware from total scratch, i sorta always had in my mind that there'd be a heap of steel and copper laying about