in a personal conversation with mr. Ciglić, who's the author of the "The Yugoslav Story" series, i asked the same question to him and he gave me a negative answer. he knows two authors of "Checkerboard Hunters", Marko and Dragisa personally and believes that "it will never see the light of the day". but for some reasons he couldn't leak out more details about this book. so my
superbee, if u get hooked by the croatian HZL topics and know french so well, u could pruchase a french book titled "La Force Aérienne Croate 1941-1945", a revised edition on the basis of some croatian / serbian materials.
www.aerostories.org/~aerobiblio/article71.html
regards