Well done sir. Have you heard about rocket mass heaters? https://richsoil.com/rocket-stove-mass-heater.jsp
Discussion
I've got a rocket stove, and I'm familiar with their operation. But not as a mass heater. I've read your page.
I've already purchased, planned (with the city) and will have installed a Pyro 4, which is very efficient and low smoke and uses some of the same principles as a rocket stove, but isn't quite a rocket stove as there is a door and there is no feed chute. The main chamber is a ceramic tube normally used in kilns. It pulls air from under the door and burns towards the back of the tube where the exhaust goes up, back over the top, then loops back around to the flue.
I meant I've just read the link you provided.. not that it is your page.
Cool, I hadn't heard of that model. Typical rocket stoves use the J-tube style, but there also batch boxes that look more like a typical wood stove. Important thing is to burn hot and clean since smoke is wasted fuel, then extract more of the heat from the flue gasses to charge a thermal mass. Sounds like you're on it.
Pyro Classics were developed locally in New Zealand, in the Upper Hutt on a government grant, before being released to run as a private company.
At the time there was no incentive for people to lower smoke emissions so the industry didn't make low-emission wood burners. Nobody would even want them. The government wanted to put in regulations, but if they had put them in all existing wood burners would fail. They decided to see what was achievable first instead of trusting industry to tell them. And they got really smart engineers to do it. Consumer Reports rated it as #1 for both efficiency and emissions for many years (a rocket-stove like reburner model has beaten it now, but it's much larger and tricky to operate).
I'm not familiar with that one, but how you load and fire a conventional wood stove really, really matters in terms of how much wood you use. That smoke is your firewood going up the chimney.