Russian Stove master Igor Kuznetsov makes available working drawings for quite a few stoves. His web site is:
If you look down the left side of the page till you see “working drawings” you will find a large number of drawings.
I built one if his stoves ten years ago. Here are the working drawings for the one I built:
Here is the video of the build:
This stove is amazing. Wonderful heat is produced on very little wood. I have owned a lot of stoves in my life, but nothing even comes close to this one.