I've done a lot of what you said, I'm not sure where to find the pack text document though? This is what my data and files look like so far:
Data:
Files:
Is there anything I've misplaced or cocked up?
Well for one the user script doesn't look like you moved it to your AppData NTW directory
Did you follow these instructions at first?
1) Place the "data" folder in your download into your default, main Napoleon: Total War folder.
Example path:
C:\Program Files\Steam\steamapps\common\napoleon total war\
If prompted that folders already exist, click "OK" and allow any folders to be merged, nothing will be overwritten.
2) Run the launcher inside the "The Great War" folder. (Make a shortcut on your desktop if you wish)
NOTE: If launcher fails to work for some unknown reason. Follow these instructions as a temporary fix:
1) Place all .pack files from "The Great War/Files" folder into your data folder.
2) Place the 'user.script.txt' in the "The Great War/Files" folder into your appData folder, here:
C:\Users\USER\AppData\Roaming\The Creative Assembly\Napoleon\scripts
Replace "USER" with your correct username.