Thanks for the links. I built my own super cheap (under $100) electric sauna, though I would not recommend it for anyone else to copy. It's lasted me about 4 years now though with about every-other-day-usage without burning down the house so... that's nice. I'll see if I can apply any of Trumpkin's Notes to my jank build [0]
[0] https://news.ycombinator.com/item?id=28495062