Thanks for your input everybody! In the end I went with "D" as everyone liked it even if it wasn't their first choice. I uploaded the module to Steam. It's my first submission so I don't really know what I'm doing and can't find it under the workshop link. If anyone knows why it's not appearing, let me know.
For now, this is the direct link (I think?):
http://steamcommunity.com/sharedfiles/filedetails/?id=523994027
