Model a big HO industry in a small space with the Cornerstone Modern Concrete Warehouse Background Building kit! Featuring special end walls measuring just 1-3/4′ (4.4cm) wide, this versatile structure kit builds into a perfect transition from 3-D to backdrop, and is ideal for shelf layouts, modules or dioramas wherever space is limited! With authentic tip-up style construction, it can be used other Walthers kits for easy customizing. Other features include: Builds rail and truck dock walls - both styles included! Correct height truck and railcar loading docks with weather bellows-seals Separate doors, windows, entry ramp and stairway Molded in three colors