Problem with this measures is that in VR it’s impossible verifying them, i cannot use a meter 
, but would be helpful if you use to fly with a Cessna in real life and you use to fly in vr too with a cessna or you tried, and you have the same perception of the size of cessna like in the real life, and would be perfect if you can try to set your world dimensions that normally start from 100% of scale and try different scales like 103% or 108% and using your experience understand which one it’s more realistic