u/AKCub1

Looking for input, copying a family sauna in Finland. The sauna there uses a common wall between sauna and changing room. The heater and water heater use a common chimney that heats the wall and keeps the changing room warm all winter.
I would like to copy this idea.
Has anyone built a setup like this? Initial research tells me it probably will be difficult to get approval, at least in Alaska.
Another option might be running one or both stoves chimneys thru wall and vertically to ceiling in changing room.
Thoughts?