UPDATE 1/31/2013 - Added Rail lines, mine and some citadel work.
Spawn point is an island adjacent to a mushroom biome and nether fortress. Includes a fortified port town, a citadel and a manor with tower and basement lab/gardens. The nether portal opens on a mirror image of the tower adjacent to a stronghold.
Image album: http://imgur.com/a/b6Bf2