Step 6: Tha barrels
I needed 2 flat braces, 2 handles, 4 hinges, 8 barrel locks and enough screws/nuts/washers to hold everything on.
Each door got 4 barrel locks since they work together to hold the door closed while spinning and they help to keep the shape of the door, since they tend to lose their shape and flatten out.
Each barrel also got a flat brace installed inside. It sticks up slightly to prevent the door from falling inward.