FlyerinOKC As far as the J3 if it is for display its not going to look right with no jugs sticking out the sides . If it is a nice looking model it might be worth getting an after market set of engine cylinders and ducts . I think you can get them in 1/5 scale . If it is not for display then I wouldn't worry too much . I would only put the time into spoofing the plane up if it was going to be apreciated . The plastic ones are a bit on the cheesy side but the plane will look a bit cheesy without anything too .