While my car was being attended to by the Rutland Hand Car Wash team, I wandered around the back of the old garage they occupy, and spotted these rather nice, and very modelable, workshops.
They don't look that old, and the basic design ought to make for an easy scratchbuild. Brick Plastikard walls and Wills corrugated asbestos roofs to my mind. Those sliding doors applied to the outside of the building wouldn't be hard to make either.
OK, there's no great architectural merit here, but the world is full of these sort of anonymous buildings, which means our layouts should be too.