I think to accommodate such variables the standard would really need to consider only the nail plate that covers the finder itself, not any overhand resulting from growing nails out longer.

Further, I would propose we settle on a single finger to use. While all fingers are important, the dominant role of the pointer finger makes it a clear candidate.

Really, if we're moving to a nail-based benchmark for generating transistor density metrics then these details really need to be, um... nailed down.