Greetings from Finland. the sauna looks good and works. However, I would make one small change when there is a small stove, so I would use smaller stones, and add adjustable air hatches to the opposite walls. One to the floor level and the other to the ceiling. By adjusting them, you get much more airy baths, which means you can also raise the temperature in the sauna to 60° -> 75°-85° and still not "bite" the baths. Thank you for these videos.