The set plans for the ST:INS bridge can be found in the "Making of" booklet of that movie - but lamentably they are used as page backgrounds, being covered partially by text and pictures...
Anyway, here's one print of 'em, supposedly sold at Christie's:
http://www.christies.com/lotfinderimages/d47795/d4779570r.jpg
These plans e.g. show how the corridor where Picard first met Worf in ST:INS actually adjoins the bridge set. This obviously isn't how the layout of the bridge deck is supposed to go in the "reality" of Star Trek. Nor is it likely that the airlock set built into the forward portside corner of the bridge for ST:FC (but removed for ST:INS) is "actually" there on the bridge.
The plans also show how the observation lounge has been redressed as the Deck 9 lounge where the buffet and ball is being held; the added partitioned space where Picard and LaForge can have their private conversation about Data is highlighted in turquoise.
As for the floorplan in real life. I would imagine corridors running along both sides from the observation lounge to the Captain's Ready room to his mysterious door.
There's no space for such a corridor if the outer wall is flush with the Ready Room window. Then again, as said, there is no window visible from the outside in that part of the ship's superstructure anyway - so perhaps the Ready Room only has a window-shaped viewscreen that is always set to "window", and in fact a corridor runs right behind that viewscreen?
And to a standby bridge officers area on the port side. Could also be the first officer's office. Don't see the need for an airlock on the bridge level.
ST:FC needed an airlock set, and this was built adjoining the bridge set because there was no reason not to. However, the movie doesn't suggest that the bridge would feature an airlock, and the door that leads to the airlock set (which was removed from ST:INS, as the set plan shows) is a simple two-piece "inner door" as seen here:
http://movies.trekcore.com/gallery/albums/firstcontacthd/firstcontacthd0363.jpg
It's probably Riker's Ready Room or something like that, then, yes.
I mean, it could also be the same door we see behind Lily here:
http://movies.trekcore.com/gallery/albums/firstcontacthd/firstcontacthd1299.jpg
After all, it
is the same door in real life. But that makes no sense. There's no outer airlock door anywhere in the forward part of the bridge superstructure, and in any case, Picard, Worf and Hawk were suiting up to engage the Borg on the
underside of the saucer. Starting out at the bridge would be lunatic...
This would provide the Captain with access to the turbolift and observation lounge without having to walk out onto the bridge.
He never had such access on other ships - why should he need it here? Then again, we have seen doors like that leading to utility spaces such as Jeffries tube nodes or closets; the second door in Picard's Ready Room (and possibly a similar door behind the other, "not airlock"/"Riker's Ready Room" door) could simply be one of those. We don't see Jeffries ladder access elsewhere on this bridge, even though the E-D bridge had such access (through the starboard side doors that match the turbolift doors to port).
Are there doors at either end of the observation lounge like the D had? I don't remember.
Yup. And both lead directly to the corresponding doors at the back of the bridge, as these two sets were really built back to back. But this makes it impossible to fit the set inside the outer shell of the ship, which is really "tight". See for example here (cut and paste the link):
http://www.ex-astris-scientia.org/scans/drex/enterprise-e-angled.jpg
Note how there
would be suitable windows for Picard's Ready Room just one deck below. The only thing that prevents us from lowering the bridge to that level are those pesky doors that lead directly to the Observation Lounge...
Timo Saloniemi