So, thought I might as well show what I'm doing with my movement trays. They are just made out of cardboard, but I have a can or two of "hammered metal" effect spray paint lying around, which certainly makes them look better than plain cardboard. So far I only have two trays, cut to fit seven ranks, four files deep of minis on 25mm square bases. I plan to build some more, hopefully for most of the army.