Dirk, Fuchida's aircraft was as you posted before Pearl harbour during the Training phase, Dark green was applied to the upper surfaces of Fuchida's Kate sometime in late October or early November. reports are that Akagi's Kates were painted overall in grey-green then over painted on the upper surfaces in dark green... it is possible that fuchida's aircraft retained the natural metal lower surfaces as some still think, depends on interpretation of the photo from April 42.