The huge cast iron rotors and griddle in the apparatus makes a big difference in heat retention inside the cooking chamber.
Fantastic modification for anyone if they desire to do so.
Temps between one end and the other can be adjusted with the top vent on the stack and they are pretty much the same once the coals are glowing and no real open flames.
Plus it burns less wood to keep at temperature because of the cast iron rotor heat sinks.
The first rotor in line gets so hot it sizzles water, next in line almost and this is with a small bed of coals.
Think of them as big energy batteries for heat that would otherwise be wasted, like a brick oven hold heat.
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