Big thanks for the complements chaps.
Lawful Evil: Please dont use that, it wasn´t that good idea. Next time I will use harder stuff.
It could work if you first cover it with card or paper, something to better spread wieghts and impacts. The thin layer of plaster, sand and wood glue is not enought for too rought handeling.
Beefcake: Thanks, glad to inspire. Please take pictures of the finall pieces later.

Pijlie: I tried to get some straight surfaces and hidden stairway steps into the pieces so its no problem.