Thank you all for the kind and supportive comments.
I've been plugging away at the goods shed but someone on
l'autre side [edit: As did Pencarrow above - apologies, I missed that] asked for a photograph showing the layout in situ, so here it is:
You can see the mock-up of the goods shed which will be another concrete building at the extreme left, switches and status LEDs for the various power inputs at the right end, and the touch-screen control panel in the centre of the bottom fascia. I'll talk more about this in detail another time but basically there are two control systems - a manual (DCC) system to control the locos, turnouts and signal, and an automated (Arduino) system to control environmental lighting and sound and to generate and display the shunting puzzle sort order for the wagons.
I was interrupted after taking the above photograph. When I returned night had fallen:
but Maxense and Jacques are
still talking: