Ya well when you are modeling based off of some crappy in game graffics to make your model there will almost always be some give and take on the design, and since this is for a fan film not tecnhically licenced by bungie it has to have 7 things different from the original ( i think) in order to be legal. This film will probably not be breaking any copyrighting because it won't be sold as far as i know but you should always be on the safe side of things.