In the following blueprints, "Layer 0" means that this is level with the path(s) that connect them. Negative numbers indicate that they are below the path. The bottom-most layer is copied all the way to the surface.
Bridge Closed Intersections
Main article: Nether Fortress/Structure/Bridge Closed Intersections
Bridge Open Intersections
Main article: Nether Fortress/Structure/Bridge Open Intersections
The Corridor Intersection
Main article: Nether Fortress/Structure/The Corridor Intersection