Yeah, if the coaster is not going to be heavily themed, I don't see this being a two year project...what would, make me interested; is more on the subject of the environment around it.
As far as I understand, Flying Dinosaur began work in early 2015, and went all the way to early 2016. But, the primary reason for that, was more due to that the land needed a shakeup for Osaka to accommodate the coaster.