Alright, I have written down all the code that can be seen in the video.
The only part missing is the protected function '_getPostModel()' because Kier didn't scroll down far enough (
) and (of course) the template file.
Take it and do whatever you want. There might be some typos in it, beware.
Edit:
Nevermind, got it working. The template is the only missing thing right now.
Edit 2:
Now I need to create that template. Easy.