Wow beautiful masonry heater/cookstove. I am going to build me one of these eventually. You can just feel the inviting radiant heat from the picture. Imagine for real...
https://maju.bluesalt.co/masonry-wood-cook-stove-plans/
I am collecting materials as we speak. Some I have been for years. I am a retired mason and have wanted to build one for years. It's time!