Rocket Mass Heater (No Barrel) build from Youtube

This came across my feed and I found the video intriguing.

I figure I would share it for everyone to enjoy.

Another perspective.

I think it is a well made video, good workmanship and he even mentions the dangers of using ceramic fibre but still uses the stuff!
I for one would not want that inside my home, every time you attend the fire you could be exposing yourself and family to toxic dust!
I did actually ask that question in the comments some time ago but never got a response.