Ripping models from xbox 360 games?

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THEN I want to put it BACK into the game, onto a back up disc so I can play the edited model on my xbox 360 which isn't chipped or anything, just a NORMAL xbox

Okay, you're running into a ton of problems here - extracting models is one thing, but putting them back in is a completely different story. Also, burning a disc and playing it on a console that hasn't been modded is impossible to begin with. You'd at least need to soft-mod it (don't ask me if that's possible with the 360, I have no idea).

Basically, you're out of luck there.