1) Yes, the 'pilot light' should be below and pointing slightly in front of the barrel. Last minute fixes left me without the time to drill the correct hole pre-FCN, so I just wedged it in an existing one
2) Extra eyehole screws are, again, due to a last minute kludge (the correct one didn't fit around the bend in the brass tubing
3) There should be a small length of rubber tubing between the small gauge and the cylinder; I suspect it fell off somewhere in the back seat of my car on the drive home
4) The cylinder is actually lit up in this image.....it's hard to see the difference due to the camera flash, unfortunately. The 'ammunition' consists of liquid-filled vials which are back-lit from a bulb in the center of the cylinder.