Chuck, I have the book (I talked about it a little here) -
http://sovietwarplanes.com/board/index.php?topic=1149.msg7875#new. It sounds like the references you have are the best ones available. Viktor's work on the models is very well-done, The Gordon/Komissarov book is the most complete in English, and Mr. Rastrenin (the Osprey book) is
the authority on the Shturmovik. With these books, I'm not sure the Kagero book is worth purchasing. The only proviso is that it does have drawings in all major scales - 1/72nd, 1/48th, and 1/32nd scale. I'm glad I bought it, but then I'm glad for any new IL-2 publication. Hmmm, Chuck, have I muddied the waters enough for you?
Regards,
Jason