I do not find a lot of merit in the super shelter concept. However if its cheap enough and you have fun doing it, perhaps you'll learn something to share with us all. There would be too much dependance on maintaining a fire, which will be affected by weather, being below treeline out of winds, being where fires are legal and lastly depending on the structure not to fail.
Looks like fun though - may as well put an electric heater in it.
Jim