looks like a good layout. However, these thing should be taken into consideration-
1. Get rid of the jerrycan. The crew would not jut give away gas, they must have their own gas and expect other tank crew to carry their own gas, besides, one jerrycan doesnt exactly fill up a tank. And it is in a horrible location, gas next to ammunition = very bad result if hit with a lucky enemy couter fire.
2. Get rid of the boots. Unless you plan to have a barefoot man somewhere in the scene they look very out of place. Why would some one set a pair of boots next to their ammo?
3. That gas mask container was only used by the fallschirmjagers. Get it out and replace it with a standard metal one with strap.
4. Make some of those boxes empty. you have 5 empty shell casings, thats 1 and 2/3 of a box. So one empty with one shell still in one box. otherwise the viewer really doesnt know where the heck the ammo came from.
5. The MG and Helmet are kind of a toss up. The helmet and mg would reayy be getting in the way while trying to pull out ammo. Try setting the mg up in the blank spot to the left of the gun. covering the guns flank. Put it behind some sand bags and have the helmet next to or on the sandbags. This will help eliminate a really boring spot, unless you intend to add something there.
Other than these 5 things, I looks like a very nice layout, except for the boring section to the left. Looking foreward to seeing this with some scenery!