wow, I'm honored you read my whole thread!
And of course you can steal the ideas! This forum is all about finding new ideas and trying them out, I can't take full credit for the column idea, it's my own variation on the "moss rope ladder"
thread in the DIY section
The moss wall is a pretty standard method and I just used the basic "put the moss between to layers of mesh" idea from that and made the cave
Anyway, I'm glad you like the idea! Now let's just see how it grows in