Windows themselves don't create drag, it's the interruption of the surface that creates drag. If they do a very good job of getting the windows put in, it shoul

Windows themselves don't create drag, it's the interruption of the surface that creates drag. If they do a very good job of getting the windows put in, it shouldn't be an issue. The bigger reason is: it's a prototype, so it's easier not to cut the windows out and fill them with glass.