An important aspect of kitbashing in model railroading is the reconfiguration of structure kits, most often to fit the geometry of a specific space. Walls can be shortened or lengthened, and/or corner angles changed to fit a given location on the layout. Another application is to use the wall parts to create a "flat", or shallow relief model to be displayed against the backdrop. For example, since it isn't needed in this case, the rear wall can be abutted to the front to double the length of the building; usually, but not exclusively, done with industrial structures. Plain sheet styrene or other material is typically added to the rear to strengthen the resulting model.