I’ve actually been interested in incorporating contemporary technology into a project like this, less analog and more digital (DVD instead of VHS, and so on). What if the lorebook was a reprint of an older 40k-inspired game? So the modern setting and photographs are the “restorers” way of filling in the missing pieces, explained away as using an old TTRPG they found as a base for their new game. There’s probably a few ways to blend these two ideas together.
In terms of project skills, I’m an experienced writer. I’ve worked with Decker and Twine, and have practice in HTML/CSS from hand-coding websites.