I hope you aren't planning on using only one camera to pull this off. I used to shoot one camera for color, and another for B&W. If you are planning on three diferent films, maybe you should carry three bodies, one for each type and speed. It is way too easy to forget to reset the film speed dial for the meter in the heat of the moment, opening the door to disaster. It wouldn't hurt to have an assistant to help keep things straight.