I'm not sure if you noticed my use of the rational fraction for sq.rt.2 of 99/70 in my previous calculation of the remen pertaining to Jim's application of it in geodetic units.
There is enough reason to suppose this unit could vary in length value in a similar fashion to the Royal Cubit it pertained to by that same ratio. John Michell was one of the first metrologic researchers to study the possibility of variances in similar units by specific ratios such as 441/440 and 176/175 unit lengths. There are others such as 385/384 but what all these variances have in common is their application in musicological parlance known as "Commas". Small variances in similar units that are nearly invisible to the eye, but not the ears of those astute to know their difference audibly. From the simplest Pythagorean 3 limit tuning ratios to higher prime values, metrologic units were constructed. The measure of the Polar Meridian Circ. of the Earth in the ancient Egyptian system was the Pythagorean 4/3 Diatessaron ratio x 100,000,000 Egyptian Ft. And this Ft. value is commensurate with the now called English metrologic system by the septenary comma ratio of 64/63. Sometimes referred to as the Eye of Horus fraction by some here still. :) It has only been since the advent of the modern Metric system that these relationships have all but been obliterated, but such is progress I guess. LOL!!