If one were seeking to built a ‘steel scene’ with just say the blast furnance itself, and then everything else as a painted on backdrop,…somthing like this…
What is the minimal size footprint required for that blast furnance structure itself
Walther’s HO scale??
Walthers HO Blast Furnace (Ashland Iron & Steel) is 28" long x 14" wide x 21-1/2" high
https://www.walthers.com/blast-furnace-ashland-iron-steel-kit-28-x-14-x-21-1-2-quot-70-x-35-x-53-7cm
Footprint 
09330000002973_fp
Walthers HO Blast Furnace 28" x 14" x 21-1/2 "
https://www.walthers.com/blast-furnace-w-stoves-kit-28-x-14-x-21-1-2-quot-70-x-35-x-53-7cm
Footprint 
09330000003054_fp
I saw those footprint sizes, BUT what I was wondering is how narrow might it be for just the blast furnance, minus the two tracks on the backside that feed it coke.
In other words if I was putting that backside towards the rear of a scene (facing the backdrop), and wanted to disregard one or both of those tracks, how narrow would the footprint then be??
HO scale