@Bob: this is the last ice age that didn't quite reach the area I'm depicting (South of Holland), and it was in the Weichselien, between 120.000 and 10.000 years ago. Long after the 'meteorite extinction wave'. I have to ask how much snow they want, as it might have been quite pleasant in summer back then, with flowering tundra veggies and so on. So lots of ochre, reds, instead of white.
@Bigben: I found that too. It's a hilly terrain anyway, so the regular dips are hardly noticable either, especially with the weeds. Saves me using your (fantastic) method this time, and also some render time, as nothing is lost.
@Otakar: they are not too heavy; the beehives+shelter is about 600kB. I could have made it much heavier, but a little bump does wonders, and I have to keep the memory use as low as possible. And little errors I can always paint/clone out in post. Added some lichens to the shelter, by the way. Really nice.
Here's an update again, better placement of stuff, as it needs to fit with doors, etc. The only thing I don't like is that I can't change the light over the 82 meters. So, going round from my little hill, I always get some areas in straight backlight, which is a mortal sin (in photography). Makes the forest kind of bland (if that's the right word), so I'm thinking of adding a few trees behind me, to give some shadows. Maybe some localized mist will work as well. And I will add some trees/trunks right in front, so you're more in the wood, while keeping the view. They have to be high poly, but only 4m high perhaps, and then nothing. Too many yellow flowers by the way, must have hit the wrong button.