lockgar, are you talking about the FF7 mod where they replaced the blocky field FF7 models with ones of in-battle quality?
When it comes to anything Chrono, if you don't see it at the Compendium, chances are it hasn't been done yet. The biggest thing hindering Cross hacking right now is that we don't know where pointers to the models are stored. If you don't know where the pointers are, you can't replace a character model with one that's a larger size in bytes. That would probably be the most basic necessity for a high resolution hack, as far as I understand things.