I, too, feel that the stance that GBX is making by calling this game a sequel is overstretched. Instead of calling A:CM an "authentic" experience, they should just say something to the effect of, "We are fans of the film and took our task very seriously. This is the game we created and we hope you like it."
I think that it a much more honest and realistic approach than saying that their creation is canon and somehow will make the viewing of Alien3 "better."
With that being said, the game is looking very polished and I have no complaints about the textures...or the size of the Dropship.
I also think it's funny that in order to call this game an authentic experience, GBX had to release a video for it that did not show The Crusher or even mention it by name. Maybe they are saving that thing for an episode that they will call "Unauthentic Aliens"?