I've now read THE G.N.B. DOUBLE C, and it's an interesting companion piece to GREEN, although a very different book. Interestingly, Seth's introduction outlines the creation of the works, and it turns out that the initial work on this book actually began before GREEN was created, and picked up again after GREEN was done (all as a sideline to Seth's other work in that period). It sort of makes sense when you think about the two works, with GREEN being much more open and fanciful, less shackled by the bonds of reality than the much more melancholy world of THE G.N.B. DOUBLE C.
It's also kind of funny that I only read the book now, since a few months ago I would have had no clue that one of the last major "cartoonists" discussed was loosely based on Martin Vaughn-James and his fairly obscure 1975 book THE CAGE, which was only just republished with an introduction by Seth.
This is the type of book it's going to take me a few readings to fully digest. At some point I want to re-read it, WIMBLEDON GREEN and Seth's earlier, more "serious" book IT'S A GOOD LIFE, IF YOU DON'T WEAKEN together, since I realized half-way through that these two are sort of cousins to that book, which revolves around Seth becoming fascinated with an obscure NEW YORKER cartoonist who turned out to be just as real as Albert Batch of "Trout Haven" fame (I assume).
A good companion piece to WIMBLEDON GREEN, or worth checking out as an independent book, especially if you find comic book history fascinating, whether real or imagined.