What I’m searching for is a feature similar to Scrivener’s editor. This would allow me to migrate my longer, more complicated projects to Obsidian as well (instead of using two apps).
The idea is to view and arrange a selection of notes (or texts in some form) and display the full context in a third pane, ultimately resulting in a new note or document.
It seems like some plug-in developers have aimed for something similar using different Obsidian tools (notes, canvas, etc.), based on the examples from my initial post in this thread.
I just now tried out the plug-in “Multiple Notes Outliner,” which in theory seems similar. It provided a better overview of a project with more than one note, but I’m unable to make it to work as expected (you can view my reply there).
That being said, you’re right. I better get some work done too. 
Anyway, I hope this clarifies things (I can make a mock-up if it still sounds unclear) so that you can point me in the right direction.
Thank you for taking the time.