That is one remarkable work of curation you've done, David; Congrats! and Thanks for sharing.
One question i have, about the form of presentation: is it your intention to make the User eXperience of this resource seem as much as possible like a typical website, hiding the idiosyncrasies of TiddlyWiki?
So it seemed to me at first, and though i saw the little icon in top RH corner of screen to open the sidebar (and that only because i'm a bit familiar w/ your UI design style :-), i tried to live w/in confines of the horizontal navigation menu bar. But then when it disappeared after a mere 2 clicks ( from "Sources" tab to one item in the list), and i was faced with just a long list of sources and a simple filter widget, i did what i think a typical user might do, and hit my browser back button... Which as we all know does not deliver the expected result, here in TiddlyWikiWorld.
Not to nitpick over UI details about a work that is as you say not yet finished, i ask this more fundamental question about UX, because i think it's an important question for all those of us in this community who aim to deploy online works that should be usable for people who may not have prior experience with TW.
What i'd like to do for such TW-naive users is give a bit of guidance right up front about what's different here (i.e. forget about your browser navigation tools, and open the sidebar -or ToC, ideally- if you get lost), but then i do know enough about Human-Computer Interaction realities to know that this this is no easy thing to do effectively.
Am curious to know what y'all think.