Thanx very much folks!
Here is how I made the tree:
the original piece is aquarium-decoration:

I put off all that plastic crap:

then I added new branches taken from the GW-plastic tree sets with some green stuff. The blossoms are from "miniNatur" (
http://www.mininatur.de/).
The ready repainted result:

@rokurota: Yes, I can share the boards as soon as they are ready. I will do them in two languages and maybe in a shorter version for presentation purpose, too.
@marcusluis: The buildings are from:
http://www.plastcraftgames.com/en/ so the roofs are included, but you need to cut rows in it to have the look like single roof tiles. I also needed to scratched all the grain in the wooden pieces... all of these come as flat pvc-parts.
@Comsquare: see you there
