I've never done one that big before. But I'd pin it up on a wall and shot two hotlights on it, one from each side at a 45 degree angle to avoid glare. Make sure the lighting is even, a light meter is invaluable in a situation like this. I'd use a portrait lens (50-85 or so) to limit distortion, but then again that depends on the space you have available to you. Since it's a flat surface, DOF isn't a factor, just make sure you have a sharp focus and shoot the highest resolution possible. One note on using hotlights. They CAN burn the image if they're on for too long. So keep that in mind.