I'm definitely not in favor of this project, but it looks like little can be done to stop your barging ahead with it anyway.
That being said, I'd like a bit more information about how these zines will be used in the archive and for research.
As you've stated, the entire zine will not be available for photocopying; however, any person or organization will be able to request any amount of pages per zine that falls within fair use. What I would like to know is will those pages also include the: TOC (where writers may have used their real names); the zine publisher's acknowledgment page (which may also include real names); the zine publisher's contact/solicitation page for new stories (which will likely include their real name and address); and any page containing information on where to send an LoC to an author?
The above may only be four or five pages, certainly within fair use, but are perhaps the most worrisome for any zine author and publisher who used their real name. (I'd imagine it would be worse for those involved with APAs, who might have had no reason to ever consider using a pseudonym.) Will these pages be excluded from search requests and scholarly reviews?
If through no fault of their own, a zine publisher or an author is contacted out of the blue by TPTB because of information found via this archive (eg. a zine containing fic about Anne Rice's characters/universe), will OTW provide free legal assistance should it be needed?