The bottom third of the vehicle is taken up with the guard's compartment which only really has any contents on the engine side.
Despite earlier writing that I don't bother with details that no one sees I have gone to the effort of representing fittings such as the electric heater, the fire extinguisher and the first aid kit on the shelf.
The empty clock side presents a problem in that we usually rely on the interior furniture to hold the glazing in place.
So what I've done here is the same as I did on the almost empty Disco Car I made earlier this year and fixed a length of L girder along the edge.
Hopefully that will do the trick.