Lighthouse ed

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Lighthouse Diagram (Map)
The Lighthouse wall in their models are rather thin (it being cosmetic), so I've beefed them up quite a bit and have an interior space sufficient for a ramp leading to the upper levels.
I've added a Ramp thru a sidedoor to get to upper parts of the Lighthouse
 ??? Indicate on map where the double in/out lines run to (????
The Bathysphere entrance to Rapture makes little sense except as a 'Scene' in a game -- Most of the ~20000 immigrants would still be waiting in line up there as Jack arrives -- IF THAT was the only way to get them down below. (It is really inefficient - such a little capacity for the people AND their possessions (even if just 'suitcases'). All the possessions of those people had to get down too. So some other method HAD to exist.)
Lighthouse construction site diagram (general/rough) indicate all the facilities 
make this
add larger map matching other showing various facilities
verify this VVV 
had to adjust (extend) the stairs off center to have a floor spacing 
Another item for the lighthouse - fresh water plant to get Rapture's building underway - used for all the construction cement (even with prefab concrete components coming by boat, more cement is needed to tie those components together and for the foundation filler.
That would require ALOT of fuel to distill fresh water from seawater
The lighthouse would serve as the early nerve center for Raptures construction. Communications, offices, planning operations, living quarters.
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I probably would have made (designed) the Bathyspheres to be more like an elevator down to Rapture's depth, with you stepping off to a 'Station' or short walkway to a very-much-closer (immediately below) 'Welcome Center'. 
Running sideways any distance just wastes time and adds complexity.
So much stuff (like for 20000 people) went down this path, so to only have such a pathetic inefficient access means isn't logical or practical (It is also bringing all those peoples' Worldly Goods too - if you didn't realize it). 
Unforunately, the games 'Wow Scene' was all they wanted to come up with (You COULD see much the same from an elevator window ...) Oops, having a deranged mega-splicer trying to tear its way in to kill you (on arrival) and disembowling Atlas's pathetic minion -- that might have been problematic if it was 'an elevator' (door opens and ...), but an equivalent scene is simple to substitute (just make it a "Glass Elevator" so you can have that nice view of the requisite 'disemboweling' and leering Splicer.
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Just because the Game showed you moving towards the Welcome Center didn't mean there wasn't a transfer station right at the base of the tubes descending from the Lighthouse.
Alot of luggage and stuff of the people immigrating to Rapture (and workmen and materials, etc...) had to get down somehow. Placing a small AE station there would have been a highly logical thing 
Sitemap
The Lighthouse was built as a symbol for Rapture, and was an impressive sight to the arriving immigrants. Later it served as the terminus marker for incomming shipments (but with the light off most of the time to avoid attention). It is likely Ryan had plans to later demolish much of the structure as a liability to Rapture's security, when increased ocean traffic and lower effectiveness of his jamming efforts made it more likely that Rapture would be found. 
A project in the MMORPGs New Rapture has intentions of finally demolishing the Lighthouse.
need to look at pix to adjust geometry/ratios
need to play to size interior etc..
extend to the breakwater and dock 
and various devices/facilities nearby
breakwater underwater construction area
booring
sub dock
radio
surface generators
Lighthouse Diagram
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Lighthouse acivities/systems/utilities :
Air intakes and valves/compressors (for Construction era Rapture)
* Observation post
* Security Station
* Radio system - transmitter and antenna(s) for Worldwide Comm
* Radar system
* Weather Station
* Power system - Diesel engine + generator sets (including for Construction times)
* Bathysphere Lift system (this Bathysphere is DEFINITELY on a Cable) Parking ? Space topside ? 
* Restrooms (can be a bit of a wait in line to descend - separate ones for the Lighthouse Staff) 
* Heating/environmental unit (that interior is a 'waiting room')
* Lightning Protection (simple enough)
* The Beacon ('secresy' - Yeah there's 'secrecy' ...)
* Communication/coordination with below (Ship-To-Shore)
* Small Boats Storage/Mainenance/Deployment
Note - the Lighthouse bathysphere should be a double hole (redundant) in case of failure/delay (and to take small cargo down (There is a bigger freight lift cable near the lighthouse that goes to Port Neptune for freighting to elsewhere in Rapture.)
comments
Fixes :
Dimensions/placement adjusted for a structure which sits near water level mid North Atlantic, which might have 60 foot waves crashing against it.
Lighthouse was raised a bit to allow the bathysphere pool below (on the lower floor) to be flush/level with the ocean water (basic physics of water finding its level)
Water level shown on diagram is the normal high-tide level (so won't get too messy in that room)
** check if it matched ocean level
Rock outcrop is also higher than seen in game (you had a concussion anyway).
*** check if it was a stupid zero thickness floor
Bathysphere Lift (and it a Cable system)
- better to guide the vehicle down a near 600 foot shaft (you didn't see it cuz you were looking out only one way with a rather narrow arc)
 
- required to lift the 28 ton bathyspehere ABOVE the water sufficiently to clear its doors ( see buoyancy )
Observation :
When the Bathysphere's descent reaches the bottom of it shaft (below the Lighthouse), and emerges from the cave (which is a cable hub), it is transfered to a horizontal cable (theres one for each direction) taking it off to the Welcome Center.
The descent time multiplied by my estimate of distance per second marked on the wall (seen while the window isn't covered by the Ryan Welcome Spiel) gave my approximation of the 600 foot base depth I use throughout this Wiki's content. It was more like 500 feet in descent , but some of the city extended below that level of the Welcome Center approach. We can ignore most of those bottomless foundations (drawn to save on detail in the big scene - so dthey idn't have to detail a poorly seen seafloor, etc ...) which impressively wastes alot of massive construction.
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Facilities Near the Lighthouse
Breakwater - sheltering dock and other things from ocean waves
Boatsheds - smaller boats would be neede to transfer from the larger ships which had to be anchored a ways from the shallow area around the Lighthouse. 
Freight transfer dock - ( alot would simply not fit in 'Bathyspheres', nor transfer very fast using those )
Harbormaster - coordinating surface work - removed
Cable Transfer to Port Neptune (most freight went this way - water-sealed pre-containerized freight dragged down the ~600 feet) - underwater system left in place
Air Intakes - Early system before the farms took over most of the are recycling operation - retained as a backup system.
Construction yard and rig - used to pre-construct most of the buildings at/near the surface (where it was FAR easier/simpler to do) - removed once primary construction finished
Powerhouse - used while Rapture was under construction - removed
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In laters times some few Splicers may have lived IN the Lighthouse - with access to the sea for food. The lighthouse interior and facilities and utilities could sustain life.