Thanks guys! Regarding the colors, I work from the colorchips made for Ken Merrick's Luftwaffe camoflage and markings. The RLM02 is indeed warmer than what is often shown in skins and RLM71 is also a slightly brownish green. There's a long way between the colorchips and the finished skin though with lots of room for interpretation. First the colors need to be lightened and harmonised so that they look good together as well as in the game environment. Then there's lots of weathering and some shading going on top of that.
That's at least the short version, I'm not sure that I got it right but there's a lot of thought that has gone into it - right or wrong!