Model building as a hobby involves the creation of models either from kits or from materials and components acquired by the builder.Categories of modelling include:Scale model buildingLive steam modelsMatchstick modelsMilitary modelsModel aircraftModel carsModel commercial vehiclesModel construction vehiclesBuilding modelsArchitectural modelsModel figuresModel military vehiclesRail transport modellingModel rocketsModel shipsFreelance modelCardboard engineeringFirearm models (See Airsoft guns)Gundam Models