We finally got around to making a howto on our Rocket Mass Heater.
We made this RMH in the fall of 2012, so we've now had two winters with it and we wanted to share our impressions.
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To sum up, it has worked fantastically and we love it. We can light a fire on a chilly evening for a couple of hours, and the thermal mass is still hot in the morning. What's more, the stove pipe goes from the living room, up into the boys' room through a heat exchanger that we made a while back. So for the whole night, without having anyone feeding a fire, the boys' room is gently heated and remains cozy.
Now that the prototype is well and truly tested, we decided to make a howto. We have also entered it into an Instructables Makerlympics Contest, so if you have the time, please go and vote for us. If you have any questions, you can leave a comment on the Instructables page listed below.