On top they cut a hole to hold three big pans.
Two openings at this end to place wood in and create air flow
The pan in the middle has been boiling the longest and they take from the right and add to the middle. It was made out of an old oil tank. In the summer they plan to use it for a grill, take the pans out and place a rack over the hole. I didn't realise how long this process really was. Once they get it to a point they take the pans inside to complete the process and finish it out.