Well, like I said I never got into this, what I mostly did was spend a lot of time talking about it with someone else who was enjoying it. Sadly, she’s not really around to discuss it right now.
As far as I know the current live version of the game might have the original standalone world server running on it, relevant to all the old docs and examples scattered around on the forum here. I forgot the name they gave it after they released creative worlds but it was, for a while, referred to as the creative mode or something similar.
I’m not sure if they disabled it with the sovereign version or not tbh. Sorry.
They did publish quite a bit of information about it though and one of the developers (@samf maybe?) shared a few scripts and stuff, as well as what users were doing with it.
Looks like it was “Prototype Creative Mode”. There are other pics and things people experimented with in some of those threads, as well.
Sorry I thought this one was linked, but there’s some different stuff linked above: