I mentioned this project last July and now it looks like the book will be out in June.
In addition to working as an Associate Editor, I wrote biographies of Babe Ruth, Carl Mays and Walt Kinney. (The bios of all of the players cover their entire careers/lives, not just the 1918 season.) I also wrote the book's introduction and co-wrote the day-by-day timeline of the season.
As I mentioned last summer, the amount of information the various SABR members found on the lesser-known players is staggering. It's a perfect companion to my book.