I just managed to make use of the framework inside a application based on the journal.ntf. It took some time to understand things but this framework does help to get some structure from start.
Most time I spend on trying to understand how to get that nice OneUI look for the core controls like the View Panel.
It was confusing with the Themes includes for OneUIv2 because they are not complete. I am using version 8.5.3.
Finally I got the idea to put "oneuiv2.1" as theme in the Application properties. then I got what I was looking for.
The oneuiv2 theme seems to be incomplete regarding styling of core controls in Notes, so stay with oneui or oneuiv2.1 if you can.