Last I looked, you can't sue someone for fan work, no matter how badly you want to.
And since this guy has created the computer models using nothing but reference material (meaning he didn't use their in-house models but made his own), they really wouldn't have a leg to stand on.
While I didn't loathe the Ultramarines movie as much as a lot of fans do, this video surely put that movie to shame. All i can say is; Damn! I hope this movie gets made (hopefully with better voice acting and scripting).
I think GW will ban the movie, as with Damnatus, but later on we will see it for share on P2P programs like Emule
Lord Macragge and wielder of the Ultramar´s Gauntlets