I just tried it out, in fact I tried it twice because I couldn’t believe it just worked without any problems the first time already 
All I did was copying, adjusting the domains and password and then pasting into the respective files of a fresh installation with 2 containers. 
Regards feedback whether anything is unclear, I only had to mull a bit over this paragraph:
It seems to suggest a 2-container setup is necessary to follow along, but then it isn’t. And I didn’t understand why it links to post 48 of the topic, rather than the initial post.