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Get insulation foam and carve it. Like a huge, huge amount of the stuff. If you can get a foam cutter you can just dig right into it and cut out some trenches. As for snow flock, a lot of model train stores have it for cheaper than GW or Gale Force 9.
So carve up the foam, mount it on some hardboard, then paint it white. Cover it with snow flock, but leave a few patches of dead earth to keep it from being monotonous. Use small pieces of wood (popsicle sticks, properly painted) for trench reinforcements and the like.
All in all it would be really, really labor intensive, but has the potential to look fantastic. I've heard people doing similar things for around $100.
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