I think this little vehicle is really neat. I want to build my own version now!
The only criticism I have is that all of your .50 ammo cans are of the WW2 variety. So, judging by the beretta 92 and the SAW in the back, I assume that this is supposed to be a pretty modern piece (i.e., post 1985). So I'm thinking more modern versions of those cans would be more likely to be found.
Also, you've made the links for the GPMG look like they are cloth, like an old WW2 Browning belt. They look tan or light grey. They should be metal, like a dark grey or gunmetal color.
Other than that, it's really a great piece! Congrats!
Rob