usually, so long as no one makes any serious money, no one cares (except the fans)
i mean, by artwork *borrowing* patrick woodruff should be sueing Games Workshop, since one of their crappy space marine warhammer2k units has been shown in their magasize holding a banner that has his artwork ripped off on it, *the hedgebank nun, recolored in blues and greys*
to show the other example, of cash involved....remember Blakes seven? remeber the spaceship from it, that thing with the 3 green engines, they called the Liberator? well a guy used to make models of it, even made models in kit form that you could buy from shops.
once he made enough cash that the bbc nd similar companies took notice of him, he was dealt with and shut down and so on...
so as long as they dont make any money or at least, and SERIOUS money form it.....most groups say, Who Cares?