It looks great , and i can see where they are making similarities to Alien regarding the ships architecture, but at the same time i also see your point about the blue effect of the thrusters being used commonly in science fiction films and those movie posters pretty much show you are spot on. It will be interesting to see how this all looks in 3D, what i have recognised in the trailer is where Scott has pulled the camera right back and we can see how tiny the ship is compared to the scale of the planet, i'm not the greatest fan of 3D, but shots like that will look amazing and i wouldn't be surprised if Jim Cameron has given Scott some pointers of the most creative ways to best utilise the 3D cameras. I have always appreciated the ship designs in the Alien films.