After finding out how the construction manual works, I could start with the first steps. (CD, HTML based, instead of the manual, the lap-top is required in the workshop.) I quickly found out, that the bolts used to mount the skids to the gear were too short, 1-3 threads were not visible after tightening the nut. I know that this will not be accepted during the EAS (http://www.experimental.ch/) / FOCA (http://www.aviation.admin.ch/) inspection later on. Consequently I had to order a "mechanic's kit, bolts and nuts" from Aircraft Spruce.
Back from Sandtner, a very nice job!
First step is to put the gear on to the skids
...and after a while it already looks like a helicopter!