Thanks but the blog post is a starting point and is for version 4. I know how to create some app plugins, but I'm looking for a way to show a visualization within an app (not create a new visualization). I'll keep reading the blog to see if there's anything there to inspire, but it's hard to work through when it's talking v4 the whole time.
The "how to build your own kibana plugins" is another good starting point, again I'm asking about the next level. Also this video is super annoying since you basically watch his face while he points at a screen you can't see and says "this should be here, do this here, etc"
Right now I'm just using iFrame embedded things, it seems to work ok except maybe the slightly annoying loader screen within the frames.