On the subject of the Stargate-verse Atlantis: I was envisioning the city to be over on San Francisco (where it landed on the final episode of the show), and kinda having a bit of a minor conflict with the Marvelverse Atlanteans (those who live under Utopia Island, also on the San Fran coast).
"Minor" in that the Alternate of Namor running things on that outpost is not exactly loving the fact that the air-breathers have, once again, insulted Atlantis by using its name (even if technically it's the fault of some guys who have long since become energy beings and give less of a crap about Earthly things like the possibility of the universe being destroyed and them starving to death from the lack of living beings giving a crap about *them*... well, at least that is the way it went on the show, AFAIK) and furthermore it is a military outpost that could be used to attack Utopia at a moment's notice.
So there's at least three artificial islands over on the San Francisco coast: Utopia Island (off-shore base for Greymalkin Industries and the X-Men, training outpost for the Xavier School, place where civilian mutants live), the Teen Titans' base (locals obviously call it "The Big 'T'"), and Atlantis (which is mostly a military and research outpost for USSOCOM).
Over on the Pegasus Galaxy there would be at least two more Atlantis-es (the city where it was at the beginning of the show and the city where it landed after its relocation. Aside from some locals of the Galaxy and some Ancients which have decided to play nice, they are mostly staffed by USAF personnel).
Over on The Line, Stargate Command has become an official arm of USSOCOM, with the other countries that were part of the Project "renting space". Russia do has its own Stargate Program, although it's been running a bit slow because of the possibility of corruption (like anybody would want Hotel Moscow to expand into space...). I guess it picks up speed once Kozlov and Zakharov start getting hands-on about it.
The idea of Feds being the messengers for Atlantis works pretty well (Fed ships have stuff like Transwarp which can do the trip with constituency, while SG ships for the most part need stuff like ZPMs to do it).
Was thinking that one of the potential contractors for the Full Circle project could be the Ad Astra Rocket Company (
http://en.wikipedia.org/wiki/Ad_Astra_Rocket_Company), probably pioneering some modification to the impulse engines or something that Fed ships would like to test.
So there are several engines, Warp core parts and miscellaneous gear on the Full Circle fleet that have "Made In Costa Rica" stamped on them.
(OK, this one may be a bit trying to fan(expletive deleted) a bit too hard, but I really want to add something interesting (and beneficial) to CR. What I have right now is just that Konohagakure is here... and I guess that the regular government doesn't likes that because, well, ninja wars are bad for the surrounding countryside (as in "devastation equal to somebody dropping a dozen nukes" bad)).