-
I can't see how fabricating an electric sauna is a difficult thing.
You underestimate, I suspect. Or perhaps overestimate the ability of the folks who would put themselves forward to build such things at prices consumers would accept.
A friend bought a house with a sauna. And a hot tub and pool. Shortly after they moved in I was round for a pool party and the sauna stopped working. Borrowed a screwdriver and had a look to find the heater (20-30A) was controlled with a normal light switch (6A maybe?). The wrong wood had been used and when it heated up it started to drip sap. Hot tub turned out to be full of something nasty and had to be condemned. Pool itself was okay although the flue from the boiler was leaking, fortunately in a drafty shed.
I can't see how fabricating an electric sauna is a difficult thing. Just a 220v electric item in a wooden room. No water. Nothing dangerous. Sure, a real fire one is a bit different.