In that case, if nothing else, I'm fairly sure (80%?) I can get a modular setup working in under two months. Fully complete with ports of all the scenes so far. I'll probably even be able to set up a more functional save-state system and get fan-translation support in there too for shits and giggles.
The only thing I could see being a challenge is if they animate the scenes in unity as opposed to doing it in... basically anything else and loading a rendered video file to unity. Given that the game is a bit over eight gigs, I get the feeling that they do pre-render the animated scenes. I could be wrong though, there are a lot of assets in the game, and at a relatively high resolution, so I could see myself being wrong about that, but at the same time, eight gigs is a lot of data.
If they did animate it in unity...
Well, I'll just hope that I could re-use their animation scenes, since doing it from scratch would take a ridiculously long time.