I'm sure all the answers are out there, I'm just not sure that they're all in the same place! I'm looking at a Chaters catalogue - six A4 pages of titles, and I don't think there's anything here that would cover all the different classes and formulae to the level of detail we would like.
I think most racing books are always going to be aimed at a fairly specific market - die-hard F1 fans don't necessarily want to read about Group 6 sports cars, rally fans don't want GT3 cars in with the forest stages, etc. I see a similar thing at club race meetings here in the UK - spectators go out to watch the FFords, then wander off when the saloon cars start, and vice versa. For many people motor racing is all about the F1 they see on telly and nothing else exists.
Yes, some of us would be quite happy with such an all-encompassing book, but it probably wouldn't sell too many copies.
If I find anything that comes close to answering all the questions, I'll let you know! Or I'll just have to write the book myself...
SB