Don't worry about the tie-fighters. Lucasfilm has slacked off on pummelling fan artists like that, who absolutely never bother to get permission first. Why? Because Lucasfilm realized that going after fans is too much work for the money it costs. If they were still hammering the fan artists, it would be a full-time job for 5 paralegals, so why waste the money? Lucasfilm won't even know about it unless some squealers contact their antipiracy section, which is only interested in actual damage, like Chinese copies of the DVDs and porno films like Star Balls.