Hey nix,
a small mistake in your zip file. The folder Wertingen needs to be in a folder called maps.
That way, when unzipping, it's directly where it needs to be.
Going to playtest now.
I don't mean to tell you how to do anything, but I think I've an idea how to turn your scenario into a zip that everybody can easily install. I'll post an example in a couple of minutes.
Cheers
Ras