I've come across this before, and yes, thought it was a very unique observation. I shall have a good look at what you have posted and get back to you. In the meantime, I thought the diagonal didn't quite hit the right spots in touching all that it needs to, so I am unsure about its revelations. I guess doing a quick ground plan according to Petrie's data should indicate how close the diagonal is.
On another note, 10,444BC - give or take a year - is the start point.