In Bryngarth II 2020 audio (Fire Kasina retreat, in firekasina.org diaries section), Rena mentions her notes on insight stages. I checked the site now, and saw that they have posted her insight map. I haven't read it completely yet, but I found it useful and to the point.

I thought probably it could be helpful for some people:

Rena’s Insight Map

(her observations of insight stages and how they related to fire kasina on that retreat.)