Maybe this will help: Unless you crash the plane, or you are flying a concored sst, the nose will _always_ have exactly the same relationship in 3D space to the furthest aft point of it's tail. The x, y, z distances between the two points will always always be the same no matter what orientation the aircraft takes. This applies to any two fixed points on the aircraft.
Yes but any change in visual scale requires an adjustment in the FDM reference. It's not the overall reference point of the model or general calculations, it's just a known reference point and the FDM is adjusted through it until the real reference point of the FDM model is about where it should be on the visual model. The name Model Reference Point just had bigger implications than what this point is actually used for. More of 'a reference point between the visual and FDM models' than 'the model reference point' for the actual modeling of the airplane. It doesn't make the alignment happen magically by using it, it just lets someone else do the adjustment on the FDM side later. Still a good thing.
Alan
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