Greetings!
200ah of deep cycle battery(s) would power everything except the sauna, but the sauna is definitely going to require either a generator or shore (house) power. If you’re in the USA, it will require a special circuit and plug like those used for kitchen stoves or clothes dryers (220v), and a European 220v generator.
Cheers!
"Proper planning, preparation, and equipment, ensure proper performance." ~ Road Warrior