Yeah well his budget grew, so too does the scope. I think he actually went and commissioned music for the series too.
Well certainly having to rely on other people (music, VA) the time to finish everything gets longer, as well as the fact that being the third chapter I think Jack wants to do it well. He will certainly have had to redo some scenes, to be at the same level of detail seen in the latest shorts.
However, curiosity remains, but I fear that all we can do is wait and hope that Jack gives some more news on the general state of progress