Wow! It's great to see the
rocket stove in action - excellent
video.
If you had a spare large pot with a tight lid, would it be worth it to fill it with water and let it get as hot as possible with any residual heat from the fire and let it just sit to cool slowly in an effort to keep the Abbey warm longer? I've always been amazed at how long my canning kettle exterior stays warm to the touch hours after I'm done. The lid is good
enough that if it's not actively boiling, it doesn't add humidity to the kitchen.