Your answer made me think of another related question. Take those 3D planes for instance, if they are, say, 46% of scale (or size whatever), then what is the reference point? I mean, there isn't really a full scale 3D plane that people actually fly is there? So how can they claim it is 45% scale of a real plane when the real plane doesn't exist?

I more than likely missing a very important fact since I obviously have no idea what I'm talking about with this stuff, but the question makes sense to me.