I've trolled around this forum on and off and had a message left on my YouTube that I should join in on the conversations here.

I've been playing around with the RMH heater for the last year. Here is the main video of the construction of it in my geodesic dome greenhouse along with a new one that shows a revised design for easier ash removal....which works REALLY well.
Geodesic Dome Part 10
RMH Heater update
I've your into domes, you should watch the entire series if you have some time to kill.
I hope you enjoy it!