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No, it is an example of a model
there are several kinds of model airplanes. One is the scale model, which is basically the same as the real ones only in a smaller version. The others are the silhouette type or the look alike.
Physical, computer, idea, mental.. Choose one of those, and think before you ask.
There is no proper proportions for a general model. Each model types have their own "proper proportions." For example, a car model would have a different proportion than an airplane model.
Expository essay
Which type of airplane?
RC aeroplanes can be purchased from specialist model plane stores. An example of a specialist model plane store with stock of these is Elite Models in the UK.
A standard passenger airplane can vary in length depending on the model and type, but typically range from about 100 to 250 feet long.
You can buy model airplane paint online at http://www.scalehobbyist.com/. You can also buy model airplanes and other accessories there.
Sure, why not
Unfortunately, this is much too general to answer. It completely depends on the type, manufacturer, and model of the aircraft.
By making the first airplane model and the actual airplane.