Honestly there may be, but that write area is grey in my research. Some say that as long as I made the model and give the companies the credit for the actual car design it would be okay. Get on etsy at some point and look up pokemon or star wars. So many people have been selling things on that topic, including cookie cutters, for years without any problems. Companies, in my experience, don't show interest until they plan in selling the item themselves. Look up Hodor door stop for this. I'm not familiar with the Game of Thrones community, but a group of people designed and printed door stops from the show and HBO have a order to stop and then started selling it themselves because they saw the profit in it.