To command my British Armoured Squadron, I've converted one of the tanks to have an open hatch on the turret, and added a commander figure left over from one of the Firefly VCs. I drilled out the solid molded cupola and cut a hatch from plastic card. However, I am a bit unsure of how the command tank should be marked, so for now it only has generic allied stars on it.
And below we have a group shot of all the completed Shermans so far. As I make a final decision on which unit i'm portraying, some more markings, perhaps decals, will be applied to the front hulls.