I'm personally glad to hear of your collaboration with David Rohl, an author whom, besides yourself, I respect and admire greatly for his contribution to history of the Middle East. I hope I am among the first to read it, and shall be looking forward to it greatly. I trust you have heard of his New Chronology and its archaeo-astronomical lynchpin, the sunset eclipse at Ugarit, 9th May, 1012 B.C., described on tablet KTU 1.78. ("Pharaohs and Kings", p. 237.)
My own research into the origins of concrete has led me to the "East"to find that concrete was used by the UrukIV civilization in present-day Iraq.The ruins of the conical Mosaic Tower are examined by members of a team from the British Museum and documented in photo in this study:
The timeline for UrukIV civilization spans from 3400-3100 B.C., immediately preceding the Pyramid Age. Uruk IV was taken over by the Elamites, who were notorious wearers of fur hats, like the one pictured on the Gebel-al-Arak knife handle, and noted by Petrie.
I'm sure your work with Rohl will be very fruitful indeed, and will lead to many more interesting connections.
Cheers and Hurrahs to You!! Rick