Does anyone have experiences in creating new worlds ?

Would be fine if we could hold this little diamond still alive.

I played around with it a little bit. Enough to make a basic dungeon that had a starting point, a hallway, a room with one hostile in it, and a chest behind him to contain the loot. But that's as far as I got.
In my opinion Arcanum is extremely well suited for mods, but the editor is horribly impractical and very difficult to work with.

The best way to go about doing this is to figure everything out and plan it before hand. Get plots, quests, all that stuff done then get people to start creating content following those guidelines.

That's going large scale... and really the old adage would apply.