Nether Portal Creation Assistance

I am trying to create a 1w x 2h nether portal to use for /spawn. I want /spawn to spawn the 1 x 2 doorway for players to walk through to teleport to spawn. I know there is a PortalCreator class but it requires a net.minecraft.server.v1_7_R1.world reference and I am unsure how to obtain that specific type of world. Any help would be greatly appreciated.

 

Just use relative locations to build it yourself.

 

I ended up doing that but couldn't get the doorway to actually spawn

I got the location, got which direction the player is facing, but when trying to change the type of a block at the location to PORTAL, it doesn't actually spawn the portal in front of the player, in fact it doesn't spawn a portal anywhere, and no errors in the backend. This is a section of the code I'm using that actually controls the block replacement. http://pastie.org/8863152

EDIT by Moderator: merged posts, please use the edit button instead of double posting.