I like the idea of the flat on the nose and leading edges, but don't forget the leading edge of the vertical stabilizer and elevators. Just try not to make the flat in a uniform pattern along the leading edge. Airflow would probably drag those particles along the depth of the wing, so a little of a streaking effect, would look pretty damn cool.
I really wonder what caused that streaking on the port wing. It almost looks like a cordite burn, but the X-1 doesn't have any guns. Maybe it's from the mothership, like an exhaust stain.
The X-1E looks like a much more fun bird to build, mostly because it lacks the greenhouse canopy, which is no fun to mask. This canopy looks more like the one found on the X-15.