The good news is that supplies of Mod Roc were sufficient to cover the whole of the latest board.
If you're wondering why it's up on its side allow me to explain.
In his usual belt and braces approach to all matters of construction Himself coats the underside of the Mod Roc with PVA to ensure it is bonded as firmly as it can be to the chicken wire.
You can get a better appreciation of the topography of this board from this view.
The two flat areas at the top will become the approach to a level crossing and the base for the ruined barn which is prominent between the tracks in the centre of the S bend.