I've searched around and can't find any info on where to buy the brackets/arms/runners that may be needed. There are also wall beds that do the same thing on a much larger scale - but the process in principal is the same.
I feel like the solution is fairly simple, but I don’t know where to start. Any help would be brilliant, thanks. This guy looks like he'd know how to do it https://www.instructables.com/id/Hidden-Door-Bookshelf/?ALLSTEPS