Here's the book I've recently purchased - "Military Aviation of The Perished Empire" (that's mine free translation from Russian "Военлеты погибшей империи"). Highly recommended to all WW1 and also Russian aviation fans:
Found some more pics of World War 2 Grumman F6F Hellcat pics here. Finally I've also found Royal Air Forces Hellcats! Enjoy!
PS. Pay good attention to the weathering that can be seen on some of the photos ;) And, of course, masking and painting process shown here :)))