try replacing castle siege, the rel files should do the warping stuff!
Already said so in this message xD
I don't discard making a castle seige based version of this stage, so the first instance is the normal fight, the second one the destroying castle, and the third one the place where you fight the final Ganon.
But that would be after releasing the first version
I'm guessing it's VIS0 files.
Already said in a youtube message, but what I'm using are CLR0 animations with certain models that allow transparency.