I really like this as a background activity that utilizes railcars. However, it is not the main activity, the trains are the main activity. This is a very convincing diorama, like a farming scene or oil and gas piping scene or electrical substation scene, or a series of highrises etc.
My point is that this is one of several layout focal points. I agree that it is unique. I have not seen or attempted to create a blast furnace anywhere near as nice or as detailed as this one. It is museum quality IMO.
However, at some point there is a vanishing return on the detail that becomes under appreciated. It is up to you to decide when that point occurs.
