"A length, evidently of 2 cubits, marked out by vertical lines in red on a wall of the South Princess' court gave 0m.524 as the cubit of the time, and this length divided into the main dimensions produced a long series of whole numbers with a very small margin of error ..."

A length between two verticals that is not marked in royal cubits is always suspect. There are alternative ways to read such a magnitude.

20.63 inch royals are excessive if you believe Egyptian metrology was a science.

Graham.