The Ash-triggering-alarm scene wasn't part of either theatrical or directors cut, yet they showed it in Crew Expendable. Dallas and Brett are cocooned on one of the landing legs of the ship, access to which is on C-deck, thus making it odd. I mean, you are exploring C-deck in Last Survivor in order to set the self-destruct system.
Ash did trigger the alarm and close the inner airlock door at the last moment in the Alan Dean Foster novelization, only for the Alien to get a limb caught in the door causing Ripley and Parker to be caught up in the depressurization; this scene was going to be in the movie but the only filmed the Bridge portion of it with Lambert and Ripley communicating with Parker, who traversing the ship, stumbles upon the Alien in the airlock antechamber.
It would have been nice to see Brett and Dallas cocooned up, but can certainly understand why they didn't. More modeling work and time I guess.
It's really excellent to see the Nostromo depicted in a videogame in this way; the detail and general aesthetic of the corridors and rooms are superb. The Ash 'voice-alike' is really good and sounds a lot like Ian Holm.
I haven't played the DLC yet, so I'm going from Youtube videos, but it's great to see the A-Deck following the set plan for the movie. They've made changes to the layout as others have commented on, such as the ladders not touching the ceiling; an extra suit locker and corridors being longer.
With the info depicted here, I will be going full speed now on developing some internal Nostromo blueprints. I don't know if I will follow B-Deck or C-Decks; the way things look on plan seem to have been done specifically for the game rather than how ladders line up level-to-level etc.
There seem to be two Engine Rooms; there's a strange walkway that goes around the top of the Undercarriage / Claw Room. But I'm nitpicking. It is a game, it looks absolutely superb and I can't wait to play it. Certainly lots of great ideas from a blueprint perspective and I'm pleased to see that.
The garage and claw room look terrific, I can actually see what the helijet thing parked in the garage looks like now :-)