There's a few things I wonder about, honestly, but this is the one most pressing enough that I'm asking here as well as in the editor-visible notes I left on the page.
Does The Secret Blueprints subsection warrant a subpage dedicated wholly to it?
Tagging @Looney Toons, @Robkelk and @TBeholder (since you edited this recently).
That's a good question...
Speaking as a troper, not as a mod: The last time I looked, it wasn't as easy to access the Secret Blueprints as it was to access the rest of the Girl Genius canon. If that's still the case, then I'd be inclined to say yes.
On the one eyestalk, Secret Blueprints, Agatha H and [foo] and extras are parts of the same GG body of canon at least loosely (and in the case of The Crown of the Sleeping King, it's supposed to be in-universe fiction), with The Works more loosely linked. On the other, GG is freeware and Blueprints aren't, so there may be a point in separating them. On the third, most other stuff here isn't freeware, and when a work is mixed, we don't separate computer games into demo version and full release, RPGT into SRD vs. paid parts, etc.
IMHO anything not in the main work only needs to be marked as such. Maybe with spoilers as well, when appropriate. I didn't see anything in or about GG spinoffs that actually warrants a spoiler yet (any revelations beyond "implied" vs. "heavily implied" level), so the last point may be moot.