Rings used for that tutorial are 1.6mm coiled on 19/64" (~7.5mm) mandrel, with a final AR of 5.0 - rings that are moved/folded during a step are marked blue; added rings marked red.
I may add, that there is a variation to this weave, that gives it a more 'Byzantine-like' look: Just turn every second cell around, when connecting the segments. And there is even the possibility to connect the 'cells' directly, without using the connector ring pairs...
Have fun :)
-ZiLi-