OK, just so I'm understanding this, please correct me if I'm wrong:
Picture #1 shows how you wrapped copper pipe around the insulated feed pipe for your RMH. The black thing to the right is the outside of your RMH. It's going to fit over that brick-and-copper-pipe device on the left. As fuel is burned, the heat will heat the water in the pipe.
The black 30 gallon water tank is not part of the RMH. I just had it setting there. While I was trying to figure out how to heat water with the RMH. Using a sealed tank to heat water, not a good idea the tanks sometimes explode. I used a plan barrel to cap the riser.
Picture #2 is just a pair of refurbished water heaters that you use to store the water heated up by picture #1. They don't provide hot water for bathing or any other purpose; they just radiate heat.
I'm using the 30 gallon and 50 gallon tanks as radiators for my outside building. I fire the RMH for about 3 hours before I go to bed. The RMH heats the water being pumped through the tubing and carries it to the two tanks in a closed loop. Its enough to keep the shed warm till morning. I can also adjust valves to heat water in a 500 gallon storage tank that I use to wash dishes. Also use solar to help heat the large tank.
Picture #3 shows your finished RMH. The black barrel on top holds water to be heated. You cut a hole in the top of the burn chamber of your RMH in order to let the heat in to heat up the water in the black barrel. The green thing is not a barrel (anymore), it's a sheath to hold the black barrel to the top of the burn chamber.
Yes. Used pipe strap to to pull the sheath tight and clay / cob to seal the edges. Exhaust stays in the RMH.
Picture #4 is another view of your finished RMH. It also shows where the copper tube from inside the RMH exits the RMH and goes to the two refurbished water heaters.
Questions: What is the water in the top black barrel used for? Did cutting a hole in the top of your burn chamber affect the operation of the entire burn system? (IOW, does the smoke still go out the chimney?)
for heating the living area why not use a small car radiator with a thermostatically controlled window fan?