Wonderful stove! I live in a tiny house which is very well insulated, its an ice truck container, and I need a small rocket stove to heat up the 12m² during the mild Mediterranean winter. I fell in love with Minnie as soon as I saw that its all consisted in one barrel basically. It would fit perfectly in my home.
1. I was wondering what is the poured concrete-like material on the bottom of the big barrel and, I presume, inside the smaller barrel?
2. Would it be ok to put chamotte bricks inside since I have quite a few of them?
3. Its a 4 inch system, so I should size openings and J tube dimension accordingly?
4. Does the metal feed pipe reach all the way to the riser, and then riser is just ceramic fiber board, or is the burn chamber insulated as well?
I'm hoping to build it before my girlfriend comes back to a cold house, which should be in a few weeks time

So, any help is welcome, I just want to make my girlfriend not freeze
Thanks,
Ensar