Just some clarifications: Academy doesn't make an SBD kit. Methinks you might mean Accurate Miniatures (or Hasegawa) in 1/48, or Hasegawa in 1/72 scale.
The national markings for the Midway period would have been simply the blue circle with white star. The red dot in the center of the insignias and the red-and-white rudder stripes were painted over or removed during the spring of 1942. It's interesting to note that at first the Navy enlarged the national insignias right after Pearl Harbor in an effort to reduce friendly fire incidents. This of course also enlarged the red dots. Then, I think, in February or March 1942, they recinded the order and had the red dots painted out.
Come the summer of 1943, white bars were added to the insignia, and at first, a red border was painted around the bars and circle. By fall of 1943, the border was changed to blue, once again eliminating red from the insignias. Of course, the red stripe in the bar appeared in 1947.