Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.
Whether you think that you can, or that you can't, you are usually right. Henry Ford
It is an offset Wood burner.
I have added natural gas burners to help with the initial heat up and if I want to just finish off some brisket once wrapped in paper.
The boxes are double walled with 2300 degree insulation between the walls. I have had a thing about train since I was a young boy. Sooo this was my Idea of a perfect project for me.