I agree with you that I have to be able to point to a reliable historical source.

Jim Alison has set out the facts on page 80 and 81 of his link, and I had no idea that a length of 12,000 Egyptian cubits had been regarded by Jim and others as significant based on historical and archaeological evidence.

I approached the problem based on another source of historical evidence which hasn't come to the attention of others working in this field as far as I know, but Jim and anyone who has read his ideas from February of this year may stumble across what I have already found, so I just wanted to put on record there is something quite significant, and I found it in 2016.

Mark