Between the room with mold sand and the space where the car’s metal bits would be put together, a pillar is marked as structurally vital.
In the mountainside are a number of air shafts, indicating where the tunnels traced under the rocky surface.
On the left you can see one of the later air shafts for the mine below, which allowed for natural air exchange with the main production areas of the coal mine. That is to say, there were no fans blowing fresh air down below.
The primitive chair caught the falling plaster.
While the building looks uniform on the outside, inside it’s clearly divided between a hoist room and shaft room (seen here).