Thanks for the nice words.
1) Carlos, yes the camo is based on the European Theater. Right before "Operation Cobra" the US First Army issued orders to paint black patterns over the OD on combat vehicles. The information on this being an ordered scheme just came out a couple years ago. It shows up on tanks, armored cars halftracks, etc. Obviously not every vehicle got painted, but it was more common than previously thought. The black camo also shows up on some vehicles in Third Army and at least the 14th Armored Division of the Seventh Army.
2) The 50 caliber ammo in the 105rd box (on the mount where the gun is level) is part of the castings that came withht the gun, just carefully painted. The 50 rd box (on the other vehicle, with the gun tilted upwards) is styrene and the ammo came from a Tamiya set, again, carefully painted.
Gary