I've got a few different versions of the AN Workprint, and I've also picked up a copy of the Playhouse 90 rendition of Heart of Darkness (starring Roddy McDowall as Marlow and Boris Karloff as Kurtz). And I've been working on some artwork that compliments the Complete Dossier release.
Now, if I can just find ANY test footage of Orson Welles' attempt to bring HoD to film. I found nothing on the internet to suggest that such footage is floating around. I did see that Indiana University has a Welles collection at their library that includes Heart of Darkness scripts. Those could be interesting. Especially to compare to Millius' AN script.