There is a good reason for his long delays on the project. He ran into some unknowns on his build and spent a solid year doing research and collaborating with scholars of the mechanism to resolve the issues. His work in this area led to some updated information on the mechanism and is now part of the few people alive who know as much about it as he does. The most recent video on the mechanism explains this. Check it out to see what he contributed to the knowledge of the mechanism.
https://www.youtube.com/watch?v=MkKgdq57uOo (youtube.com)
(post is archived)