I've taken a look on the maps in edit mode. When he says there can be problems with NPCs getting stuck, we shouldnt change too much until he's giving us a small instruction.
But if the creator wants, I can add some details to the existing maps to make them more fancy. Or he can give me the task to make a new map.
I'd love to help this mod to get better, as I already love it right now, so if you need help, write me and I will do what I'm able to.