I dont think thats how its done....but I dont have any better advice.
I would imagine its aged in bulk in a large warehouse that maintains ideal conditions of temp/humidity/airflow. I bet the hardest part to tackle on a small scale is going to be the airflow.
Also, I bet the fermentation take place like a compost pile, with the tobacco itself breaking down to create heat in the heart of a large pile of leaf.
"By this all will know that you are My disciples, if you have love for one another" John 13:35