If I had the money (and talent) to actually shoot a few extra scenes, here is how I figured the cocoon scene could have fit in:
(1)  after she sees Lambert and Parker dead (and does the disgusted  grimace), she collapses/sits on the floor outside the Parker/Lambert  death room in the hallway, muttering under her breath "what am I going  to do now?" (or something to that effect). 
(2) To the left  foreground of the screen image (with her going out of focus) you see an  intercom and start to hear moaning, which starts muffled and low but  starts to pick up.
(3) insert close up of Ripley looking up (on her eyes). This shot could be borrowed and manipulated when Ripley comes up the ladderwell later on.
(4)  close up of the intercom (from the side) with Ripley entering the  right, pressing some buttons.  On the intercom is a screen, which she  toggles a display of the ship.  Using similar FX to the photo machine  Deckard uses when scanning the photo in BLADE RUNNER, she sees the  location of the sound coming from the landing leg on the other side of  the ship (in the starboard engine).
(5) camera moves/swings slowly  from left to right, starting from the left side of a corridor. When it  reaches the mid point (looking straight down the corridor), you can  already see Ripley more than halfway down running (so when the shot  starts, you can hear her running down the corridor away from us, with  the camera swinging around just to glimpse her running away).
(6)  insert edit of the scene from the dvd (with Ripley being a bit more  emotional), where you then edit her heading to the engine room to set  the self destruct after this scene.  Movie progresses as normal.
While it is not necessary, I always felt that  Ripley and Dallas (per a previous version of the script) were lovers,  and not long at that.  With her having to kill Dallas (and knowing that  there are definitely no other survivors), it would cement her  determination to survive (which is what I assume is the point of the  different acting in the cocoon scene on the blu-ray - it ends with  Weaver/Ripley with a look of determination on her face) and her figuring  there is no other decision left to be made.
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Okay, now as far as the edit is concerned... I cannot say it is dead (as in I will never do it), but it won't be any time soon.
 I  am just having a really bad time wrapping my head around Adobe and  Vegas and I just don't know if I have the ability to do this.  I am  still working on it, and recently acquired a 3D model of the Nostromo from this guy:

There is also this, and this.
And this:

Cinematics of Nostromo landing gear - Improved
I  have no idea what to do with it, but I have it.  Like I mentioned in a  previous post, I will be focusing on a KILL BILL edit (titled KILL BILL AGAIN)  and a WIZARD OF OZ edit using the DARK SIDE OF THE MOON / WISH YOU WERE  HERE / and the PIGS song from ANIMALS to create a proper Pink Floyd  alternate sound track using the blu-ray rips on the web for the video.   This will at least get me feet wet, as the WIZARD edit will be primarily  audio editing, and the KILL BILL edit will be much the same (mostly new  music, some color timing alteration [specifically when the Bride  attacks Bud at night - the scene will have a more 80's blue-grey hue]  and an FX scene at the very end).