i thought i would do a vid of my work so far.. i only actually noticed a few errors when in game and some of those you can see in the video heh.
http://www.youtube.com/watch?v=fb76FH_bSR4
and mavrik, the middle area is un even in places..it's not completely flat, so if you are worried about snipers, don't be. cos if you prone you won' really be noticed..failing that, you have a fair few trees to hide behind