Looking at the set up it's a shame that 2/3rd is going to be hidden sidings either side.
So, with a rush of blood, how about making the siding in the foreground (above the stand number 16) the inside of a warehouse. A tall (rear) wall would butt up to the wooden cassette you already have and a roof at an angle would come out to an extended fascia.
At the front a shallow platform would complete the scene. The siding would only be 2/3rds the length area and the platform would then extend round to the rear wall and allow you to use it as a loading bay.
Apologies for the crayon drawing, but like this. Red being the platform, green the wall, yellow the roof and black the extended fascia.
The roof would have sky lights and a warm lamp above would cast nice shadows on the inside scene below, windows at the rear, if made clear, would show the stored stock behind and give an impression of further railway activity outside.
Apologies if you already have plans for this area, but it always strikes me that end to end layouts suffer terribly with unused space at each end.
You could even loose the angled roof and make the rear wall double height and model the 2nd floor with stored goods.
Now you have two Cameos for the price of one, an inside and an outside
Mick D