Bertel,
Yorktown CV 10 should not be confused with Yorktown CV 5 that was sunk at Midway. Since you are building CV 10, the color scheme will depend on when during the life of the ship, you model will portray it.
If you show the ship equipped as it was in 43-early 44, the ship should be overall Navy Blue 5 N with the horizontal surfaces as Deck Blue. The ship would have the hangerbay catapult extensions still showing at the forward hanger openings and would NOT have the 40 mm gun mounts installed on the stbd side below the island.
After a refit in the spring of '44, CV 10 carried the 33/10A scheme.
This would also depend on the way you want to display the radar antennas, etc., as their positions changed as did the paint schemes.
There are photos available on the US Navy History site that will help.
Hope I helped.
Mike