Here are my Weirton Steel backdrop steel mill buildings (l to r): Blooming Mill, Crawford's Crossing highway overpass, Open Hearth. The backdrops sit 30 degrees out from the wall and are, respectively, 18" and 22" wide across their fronts.
I have a Strip Steel backdrop mill in the works that will be 42" across the front. It will go in the corner to the left of the Blooming Mill. It will, roughly, resemble the photo below.
Hope that helps.
George