Far from an expert here, but I have built my own home and installed my own wood stove and chimney flue pipe. In planning it all out, I also tried to consider any other problems I might encounter. Have you considered the possibilities if something might happen to go wrong one night, and for some reason, the fire might go out. I know very little about rocket stoves, but how much smoke and CO2 could be produced if it were to drop below that magic percent number if something went wrong? I am not trying to discourage you, but just hoping you have all bases covered.