He still makes up the story on the fly, no wonder it takes so much time to create renders...
The only thing is the guideline for the event but the rest is not writen yet, he should have done it like we do for movie scenarios a long time ago and the development would have been gone faster with no last minute changes, this is the main problem and why it took more than 7 years, there's nothing to do with the number of characters or event, it's an organization problem! And this guy is supposed to be german? Where's the efficiency!