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If you are looking for a larger data set? there are just over 100 stone circles within a 30 mile radius between West Cork and Kerry. This very dense grouping would imply a common set of builders and perhaps common reasoning behind the designs.
It is difficult to see any evidence of accurate measuring at these sites, I would fall on the side of the anonymous comment.
If there is a value at 2.72 feet it seems likely that it represents the average stride length of a mid-late Bronze Age circle builder, not much different from now?
This could also be applied to the building materials, if accurate measuring was an important factor then it is not evident in the finished structures around this area. There is definitely no shortage of stones here and should the builders have wished all the elements of these circles could have been very precise. What we do see is a great variety in size, shape and location, none of which has much common ground other than orientation.
We keep trying to assign modern parameters to people who had different values. If there truly was an ancient unit of measurement did it survive into later monuments? maybe this requires a data set from later structures to observe any continuity.
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