Very cool proof of concept; now taking it a lttle further you could mock up a tank-like room/cube/area so that each team is in the same tank interior and then lower the lights to enhance the atmosphere.
Also, you could open the battlefield for viewing by people not actively on a tank team. Along with the spectator area you could add some fixed gun emplacements that the spectator could operate to try and kill a tank.
Lots of ideas but I need lots of time and money....

Good luck and have a great time,
DT