I found this for you Skow, hope you can read German.  This is probably not the one you are talking about but it is an excellent example of a tree.  This shows several in step process pictures. 

http://gidian-gelaende.de/phpBB/viewtopic.php?f=3&t=971
Here is one of the in progress images.
Bild

And here is another partially finished one.

Bild

And here is the finished tree.
Bild

All I can say is that those Germans really do take their terrain seriously.

Duke



This is another interesting build.
http://gidian-gelaende.de/phpBB/viewtopic.php?f=3&t=261