I like it, it looks like something you could actually wear in the field. Just one suggestion, add elbow pads to go along with the knee pads. Trust me, espcially in urban terrain, they come in really handy for keeping your elbows from being smashed up.:)
It looks a bit different from the original.
I've been trained on that Machinegun. It's called MG3 today and is still in use in the german military. It is what I call a big rifle: heavy recoil (because it's used for the reload mechanism), 12 kg weight, 7,62 mm x 51 bullets and almost the entire weapon is made of steel (only the part you press against your shoulder, don't know the english word, is made of oak). But soon the MG4 will take it's place. It's a pity, somehow...
However, It's a great pic!