I built my bench back in 1984 and never imagined that I would need more room. I do my shot shell reloading in the basement, becasue there isn't enough room to store the wads, hulls, and shot in my gun room.
The left hand portion of the bench, above the scales, is a powder mill. There are 3 seperat soldered bins that feel similar as the powder trickler by using the rods that protrude from the panel. They feed into a small hopper down a tube into the pan of the scale.
There are some really well thought out ideas that you guys have come up with.