I don't want to discourage you, but if you're serious about this remake project you'll just end up being dissapointed. As has been shown with Nathan Lazur's Chrono Trigger Resurrection project this type of thing is not tolerated. If you get to the point where Square feels you're actually going to release the game to the public, they'll shut your project down.

http://www.opcoder.com/projects/chrono/