Here is the link to the page with the vesica derivatives link:
Some of this page is from the first iteration of my website and some of it is in the article posted in the article section back in 2000. Also on this page are some of the fractional relationships between ancient units from Michell and Neal, with a little input from me.
It is not surprising that the ebony tipped cubit rod caught de Lubicz attention, because he believed that he found the use of the royal cubit, the remen, the meter, and what he considered to be a short royal cubit of .518m, in the dimensions of the Luxor temple, as well as in the dimensions of the art and inscriptions on the walls of the temple.
Lelgemann believed the .518 Nippur cubit was the origin of the remen, and the remen was the origin of the RC. He cited Rottlander, and I think a lot of his numbers came from Rottlander's studies of old length rods. There are a couple of Rottlander websites, or mirror sites.
When I was working on my remen article I was looking to see if my remen:meridian ideas had been commented on before, and I reviewed Stecchini's work. He acknowledges the remen but does not really comment on it. One thing of his that I reread, that caught my attention, was his comments about a Perseopolis map. Stecchini pointed out that Persepolis was not built until after the Persian conquest of Egypt around 600 bc and that Persepolis is very close to the same latitude as Giza. Possibly as close as possible given the terrain and the water availability in that part of the desert. Anyway, Stecchini thinks that Persepolis is where it is based on the longitude as well as the latitude of the site. Perseopolis is very close to the main alignment on my website and is listed on the alignment and I noticed a long time ago that it is very nearly the same latitude as Giza, meaning that the halfway point between the two is very nearly the maximum latitude of the alignment. I had also noticed that the distance from Giza to Perseopolis is just slightly over 5% of the circumference. After rereading Stecchini, I decided to remeasure the distance from Giza to Persepolis, and noticed that the distance is very nearly, if not precisely, 4,000,000 royal cubits. Since 4,000,000 meters is 10% of the circumference and since the cubit is .5238m, this gives 5.238% of the circumference from Giza to Persepolis.
de Lubicz proposed a royal cubit length of .5236m, or (sq rt 5 plus 3)/10, that he said could be regarded as a 1/6 chord of a circle with a diameter of 1m. .5236 x 6 = 3.1416 - so, voila.