Yea I'm looking at my new book and watching the scene and going off of Sil's script info... and it doesn't make sense to me right now, or maybe at least Ripley's journey doesn't make sense to me right now.
A potentially dumb question first, where did Ripley activate the self-destruct sequence? It was the engine room I assume (Upper C-deck)?
Anyway, I think she came down from the mid-section of B-deck through a companionway (to the side of a stretch of hallway) that leads to the forward undercarriage chamber on C-deck.
I can also see in the stern how one would get from B-Deck where the shuttle is to the engine room on upper C-Deck via a single hallway on C-deck (companionways at each end).
I'm just trying to remember at which point the deleted scene takes place in order of events, because from what I've gathered there aren't a lot of ways to actually to go from the mid-section to the stern and vice versa. In fact I may be wrong but I only see one way, you'd have to go from the bow or forward midsection of B-deck down to C-deck then travel to the rear of the midsection that leads you up another companionway to the engine room which in turn connects to the shuttles on B-deck.
On a second look though you could also go from B-deck to upper C-deck via air ducts but I don't think Ripley ever took that route.
Right or wrong I'm kinda enjoying this.