What do you think is the best choice for doing a shallow, concave pocket. It is about 34"X34" and only about 1/8" deep. We are considering a 2" ball end mill or a 2" flat end mill. However, if you have a better idea, it is appreciated. The pocket is being cut into a composite material with a 5 axis router. Any opinions are greatly appreciated.

Have you thought of using a flycutter set at an angle (moving the head at a drastic angle) and lowering it down until the width is matched?
AL T