Thanks, guys.
Here you go. Proxy and detailed version...
MeadowsInTheSky_Proxy.jpg
MeadowsInTheSky_Smooth.jpg
I put the red surface and the white structure in separate groups and subdivided them with the same level of detail. I could of course have achieved the same result with all the geometry inside one group by using the crease-tool to get those sharp edges. But like that it was simpler to do...
[EDIT] Thomthom, I gave your plugin less credit, than it deserved. Out of interest I just tried to achieve the same inside one group, selecting all the bounding edges of the red surface and creasing them with one click. Worked like a charm! And now editing the model is way easier, because its all in one group π [/EDIT]