Remember that the detailed color photos you see typically come out of museums. Not necessarily how the aircraft was built. To complicate if further these aircraft came out of several different factories. In the case of the Corsair they were produced by Goodyear and Vought. So what you see in photos can vary from reality and by who built it.
The photos in the "in detail & scale" book are the Corsairs down at the Naval Air Museum in Pensacola, FL. What I like about these photos is that the museum didn't restore the interiors. They appear to be as they were flown. On one page they have the interior from the F4U-1A and on the other page they have the FG-1D. You can see the differences in cockpit layout as well as how they painted them.
As for the wheel wells and how they were painted it appears to be a mixed bag. The photo from the museum shows that they painted it the same as the underside of the plane. This seems to be true of most of the photos I've seen and the text of the book says as much. The struts can be either painted the same as the underside or bare metal but most appear to be painted.
Newly restored birds that are restored to fly are not a good source for color varification. As an example the bird I'm sitting in has yellow chromate in the gun bays and the wheel wells with green chromate in the cockpit. The one that is being restored at Vintage Fighters (web site bentwing.com) is green chromate throughout. It's also not the same green chromate that was painted on the original aircraft. It's gloss green chromate instead of flat. These guys want their 2.5 million dollar airplane to keep looking like a 2.5 million dollar airplane for many years to come. That said if you look at the photos from the tear down stage you can see how the original aircraft was painted.
Bottom line is I think the "in detail & scale" book is your best reference.
Good luck!
Dave