Thanks to Phil Smith, here is the track plan for Alexandra Junction. As construction progresses, there will no doubt be small changes, but the top seven boards are fiddle yard, and the bottom five are mainly scenic. It is likely that the two stubs at the front will continue behind the backscene to terminate at buffer stops next to the fiddle yard. There will be tunnel mouths at each end of the scenic section.
The front of the layout comprises the main line and two freight loops. A line leads off the main line heading to a run round loop. Freights arriving in this loop can run round and disappear into the Docks complex off scene, or shunt into the hidden sidings in a complex of warehouses. How many sidings and whether hidden or not will be determined as track laying progresses.