I found this archive a few weeks ago of some of Bastian's videos, since a Youtube channel that used to have them got shut down. It doesn't have his "final video" but I've managed to find that on the wayback machine somewhere and have it downloaded.
The weirdest thing I've found is definitely the amount of tribute videos/photos to Bastian. Here's a one of them:
[You must be registered and logged in to see this image.]Although I've also managed to find archives of Bastian's other websites, one of which had a photo of Bastian's airsoft/gas guns.
[You must be registered and logged in to see this image.]Here's also a photo of Bastian planning the attack on GSS with a map he created of the school:
[You must be registered and logged in to see this image.]I do eventually hope to create a comprehensive archive of the Emsdetten Shooting and upload it somewhere, so if anyone has any photos/videos/documents (especially to do with his multimedia manifesto) that would be really cool.
I've also requested a couple of FOIA's and emailed the administrator of WKEA.org, which was the forum where Bastian posted his multimedia manifesto, but haven't received a response for anything so far. If I'm honest I've slightly given up hope on finding any more of his multimedia manifesto, since the majority of it seems to be lost completely or available only to a point via archive.org or other researchers. It has all come to a bit of a dead end, but I'll try and keep this updated if I get any new information.