"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. In model rocketry, kitbashing refers simply to using the pieces from one kit to build a different model. This is typically used to create unusual and/or especially complex models. With radio-controlled aircraft, such kitbashing can be done to either kitted aircraft as they are being built or more often, so-called "almost-ready-to-fly" (ARF) aircraft to change their appearance or flight characteristics to suit the owner. This can even extend to "plans-bashing", where a plans-built model has its construction plans partially re-drawn by the builder, either by hand or with CAD software before any part of the model's airframe has been fabricated from raw materials. See also Mashup (disambiguation) Greeble References Scale modeling Special effects Toy collecting