The maximum size is 4GB because a FAT entry is 4 bytes -> 32 bits, 2^32 = 4GB.
In this game, there is a folder named "demo", some of its files are used but another not (I think).
Well, I have started again with this game. I have been debugging it in order to know how to parse the script files and now I know it. I'm almost redoing my script editor becuase it only works with the first script

. Now it's opening every script, I have to do a function to export to XML or text file (what you prefer) and import again. I don't know how many time it will take for me.
By the way, the images can be translated using Tinke and the subtitles of the movies (normal text files) too. The fonts are normal NFTR files so can be edited too (with NFTRedtir, iirc they give problems, so tinke can be used too

).
So there a lot of stuff to start, but we need a coordinator, specially if we are going to translated the game to more than one language.