Looking at the board, there's a pad for a PC mount 9mm pot in the bottom right hand corner. However, the peak and gain pots are all the way at the top of the board above the switches. On the drill guide, the hole for the optional volume pot is at the top between the gain and peak controls. It's in the middle, but offset, closer to the switches.
What am I missing? When I look at people's builds I see the volume in the middle but on center with the other two pots. Are people just putting the volume pot wherever they want and mounting it off-board? I'm a bit confused about how the drill guide matches up with the board layout (or doesn't - or maybe I'm missing something obvious about the pot being mounted off-board).
You just wire it up and place it where you want it.