public virtual IVehicle Build(DrivingStyle style,
     VehicleColour colour)
 {
     IVehicle v = SelectVehicle(style);
     v.Paint(colour);
     return v;
 }

 public static IVehicle MakeVehicle(Category category, DrivingStyle style,
     VehicleColour colour)
 {
     return category == Category.Van
         ? new VanFactory().Build(style, colour)
         : new CarFactory().Build(style, colour);
 }

        public static IVehicle Make(Category cat,
            DrivingStyle style,
            VehicleColour colour)
        {
            VehicleFactory factory;

            if (cat == Category.Car)
            {
                factory = new CarFactory();

            }
            else
            {
                factory = new VanFactory();
            }

            return factory.Build(style, colour);
        }

 public Sport(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
 }

 public Coupe(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
 }

 public Saloon(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
 }   

 public virtual void Paint(VehicleColour colour)
 {
     this.colour = colour;
 }

 public AbstractCar(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
     // Starts in standard gearbox mode (more economical)
     gearboxStrategy = new StandardGearboxStrategy();
 }

 public AbstractVan(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
 }

 public BoxVan(IEngine engine,
     VehicleColour colour = VehicleColour.Unpainted)
     : base(engine, colour)
 {
 }

 protected AbstractVehicle(IEngine engine,
     VehicleColour colour = VehicleColour.Unpainted)
 {
     _engine = engine;
     _colour = colour;
 }

 protected AbstractVan(IEngine engine,
     VehicleColour colour = VehicleColour.Unpainted)
     : base(engine, colour)
 {
 }

 protected AbstractCar(IEngine engine,
     VehicleColour colour = VehicleColour.Unpainted)
     : base(engine, colour)
 {
     _gearboxStrategy = new StandardGearboxStrategy();
 }

 public virtual IVehicle Build(DrivingStyle style, VehicleColour colour)
 {
     var vehicle = SelectVehicle(style);
     vehicle.Paint(colour);
     return vehicle;
 }

 public Pickup(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
 }

 public Pickup(IEngine engine,
     VehicleColour colour = VehicleColour.Unpainted)
     : base(engine, colour)
 {
 }

 public AbstractVehicle(IEngine engine, VehicleColour colour)
 {
     this.engine = engine;
     this.colour = colour;
 }

 public Sport(IEngine engine,
     VehicleColour colour = VehicleColour.Unpainted)
     : base(engine, colour)
 {
 }

 public BoxVan(IEngine engine, VehicleColour colour)
     : base(engine, colour)
 {
 }