Hi all,
I've added a table to this wiki page [1] to keep track of the work. Add your name to this table before you create relations for admin_level 5/6.
[1] http://wiki.openstreetmap.org/wiki/EN:Switzerland/swissBOUNDARIES3D
The import is now done and all cantons can found in this relation: http://www.openstreetmap.org/browse/relation/1685640
I'll write a short summary tomorrow on how you can help to improve the data (aka what relations should be created)
Regards, Thomas