You could always build a measuring stick/ruler in 3Ds Max (or whatever modeler you use), for example, from a stack of black and white 1 unit cubes, maybe in a 3 axis shape, and import that into Vue. Not very elegant, but maybe some help.

Leave it in your scene as a reference until you're done sizing stuff, then delete it.
Maybe make it into a Vue .vob model and offer it to others.

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