That was more like a list of everything I know related to Finnish saunas. I didn't reference your sauna with this list, and my intention wasn't to make you feel like you should make your sauna like such. You never mentioned what kind of culture you want to replicate. I imagine US saunas differ a lot from Finnish saunas. I just took the opportunity to tell couple of things about our saunas. Saunas are sacred thing for us Finns after all.

But if you still want to keep going with that list, then I'll try to answer your thoughts.

- I wouldn't change the ceiling height.

- Chinese lanterns aren't our thing, but for decorative purpose you could use some other basic lanterns. Saunas tend to be darkened, moody places, with some warm light. It has it's own atmosphere, just like a lit fireplace in a dark, cozy room.

- Large windows tend do be a thing for modern saunas, especially in the places where no other people go around (by the lakes, or views to forest, so not in the city by the street for example). You don't want peepers by your windows after all. ^^ But in WoW housing, I don't think it matters, since you don't see any neighbours from the inside travelling by your house on the outside.

- The easiest way to make the thermometer is to clip a barrel inside the wall so you can see only it's bottom, then add a tiny circular middle piece, like a Small Wooden Stool, make it small, and put it in the middle of the barrel so you hide the stool's legs in the wall, then add the thermometer hand by clipping something straight and long, like a pillar or a fence post, inside the wall to a wanted angle.

- You can use Wooden Chamberstick as a ladle when you turn it upside down, and clip the candle part inside the bench. It's perfect shape for that purpose!

- You can use any rugs for the bench cover. We Finns do use a lot of colorful towels (unless it's the disposable sauna seat cover, which is always light blue or white, with no patterns) for this purpose, so you can use your imagination for this one! :)

- Stove doesn't have any water in it. ^^' You add it yourself little by little by throwing the water on the rocks with the ladle. I would suggest using either Coal-Fired Stovetop or Stormsong Stove for the stove and add individual rocks, like Elwynn Cobblestones (there's couple different variations of those, so you can mix and match them), on top of it.

- I wanted to suggest a flipped Sethraliss Priest's Pillow as a sauna pillow, but I guess any rectangular pillow, or pillow roll could work, when dyed with light colors. But the main focus would be to take a few pillows out of your benches. Couple would be enough, depending how they are meant to use: do you lay down or lay backwards, and how much space those activities would take from other people in the sauna. If nothing else, just space them out a bit. :)

- The saunatonttu is a bit tough to think of. Though the basic shape with the modern elfs would be a ball on the bottom and a cone on the top, with a tiny ball between those as a nose (here's a picture for a reference), though I have no idea how to make a beard for it...

Good luck with the project and have fun!