Okay I use to have this plug-in a while ago, it was a portal plug-in that was kind of like a network of portals, what you would do is in the config files you could define a portal shape GOOG G= Glowstone OWWO O= Obsidian/portal material OWWO W= Water GOOG And thats what you did to make a portal, after you make it in-game and put a sign on it or near it, etc.
Stargate plugin? Got that on my server at the moment, pretty epic. Anyways, I think you can world edit it so it can work according to my friend.