My dad built this many years ago at the Armadillo Ranch. Just use old twigs and sticks to get a fire going of split oak and mesquite from the woods out back.
Rain falling on the fire pit cover making a lot of steam.
The heat enters at the top on the left and has to "Down Draft" through the grill toward the bottom of the pit to then exit the chamber and enter the smoke box on the right below the stack when the lid is closed.
