Update re: WDSF and the Hugos
While the Hugos Administrator will not rule on eligibility before nominations close, two SMOFs* generally considered experts on the subject have told us that they believe WDSF is not eligible in any Hugo category, including Best Related Work.
Individual non-fiction pieces are eligible in Best Related Work, and of course the stories remain eligible in their categories according to length.
And while I do not qualify in any category, Wendy N. Wagner qualifies in Best Editor Short Form for her work as Managing Editor of Lightspeed and the Women Destroy projects.
*Secret Masters of Fandom