Slightly off topic I decided to build a squad of Brettonian men at arms. In the process I came across the GW modular movement tray. A cunning bit of stuff allowing the collector to build any size of movement tray. Just cut the floor size you want and then cut and glue the edges as desired. The only limiting step is the provision of only 16 corner pieces which limits each pack to 8 movement trays.
Here is is with the 7 x 4 tray for my Brettonians just built.