Hold on let me try.
Result: I had a similar problem. Maybe it is that you have to edit the brres files. Or that the final smash is like pit's. Pit's cant be extract because when extract the 000.pac inside, nothing shows. For ganon, one folder shows. Maybe you have to keep trying and trying to get it right. You'll go through alot of freezing. It is a real pain in the %. Trust me.
Then how can people modify Pit's FS? They do it like normal characters textures?