Great that you’re interested.
There is the list of tasks on our Trello board which over time will start to correspond to some of the partitioning, and I created a draft web app architecture diagram, but no, there isn’t and won’t be much more than this while we’re still experimenting and researching how to do this.
I almost forgot! There is an early SAFEpress Outline Design on the repo which will give you an idea of my initial thoughts about components and function but it is a brain dump and still only high level.