In some old model sites I used to see a lot of "cardboard cutout" human figures used to scale objects. Basicly a flat, planar mesh shaped like a human, for scale only. If your modeller supports layer, keep it in a BG layer for reference, or build your model with it, then delete the reference cutout. I suggest this for those of us who are "numerically challenged" or lack the proper patience to do it the proper way
