Cool! Similar situation here: old timberline I’d like to replace and just use the chimney.
I’ll see if enough others respond to make it look realistic, and then see about finding an instructor.
If there are only a few people, maybe we can do a couple of reciprocal “
rocket mass heater raisings” in the area. Even if we can’t afford to bring in a teacher, having a couple people would get each
project off the ground at least...