blue to red will be impossible with acetate. you will get a mix between the two colors, because that is essentially what you are doing. Perhaps the LEDs are white and shining through a blue film, I actually don't know which it is.It won't be difficult at all to change out the LEDs, at least no more difficult that adding the acetate. However the acetate won't truly void your warranty and won't require a soldering iron. From my understanding the keyboard of the AL Books are not removeable as before because you now install RAM and airport from underneath. You'll probably have to remove the whole top, including keyboard, like they did in the take apart pictures. Good luck and take LOTS OF PICTURES