Here is the catwalk from above, seen from another part of the distillery. The big round things are the fermenters. There is a fermenter on each side of the lower part of the catwalk, and some more on the high side of the catwalk (on the right in the picture). I work inside that cement hallway, which is the catwalk. If you look down in the left corner, you can see a train car. Maybe that will help you picture the size of the fermenters.
Next slide: Filling the fermenter
Previous slide