Question: Fictional Maps with worldKit?

Tony Straka is looking for a way of creating maps of imaginary places with open-source web mapping tools. He writes, “One thing I have searched for is fictional maps created with one of these programs and I cannot seem to find any. The short question is, do you know if it is possible to create a map in worldKit using custom models and imagery? I was wondering if you knew of any fictional maps like Middle-earth, Narnia, Lost etc. created with worldKit or another open-source Google Maps clone?”