There are three additional behind-the-scenes videos, though seemingly only accessible via their Patreon or YouTube membership. Appears to be a passion project from Craig Frost specifically, bravo to him and everyone who worked on it.
Here is a link to their official channel playlist with all the relevant videos:
https://www.youtube.com/playlist?list=PLW1Yb5N9dD8c8v3hZwvOTXJ6O-3pVjxqF
Unsure if the " knightmare.com/fanzone/fan-projects/audio-and-video/ " page is still being updated, but this may fit