Badda bing badda bang! Success! The key was adding those four ../ dereferencers before my WhackerMod/data/... etc bit, and also using forwardslashes instead of backslashes, which is bass ackwards... Also Dol, forgive me, in my defence I did spend at least an hour googling this and searching the Org and TWC forums, but found nothing concrete.

Thank you both very much for your help!