Welcome again. I have found CC3 can be very useful in mapping out a NWN 1 campaign world.
Below is a NWN world I was involved in for a bit. First the 'Regional' map in standard CC3 map format (yes the continent was a reverse of Australia), the second is a map of each of the play areas for the Persistent world, and the third is a map of the In-Game tiles overlaid on the WORLD map to show how the two were closely meshed.
Best of luck in your efforts sir!