Dolphin Island DIY Book Nook Kit for Adults, Infinite Magicspell Library Booknook with Flame Illusion

There are tons with mirrors, this one seems to be a fav and Funpola has a whole set of them! Yes, you can use your own mirror and edit a book yourself, just keep an eye on placement of the buildings/items in front of the mirror because, well, it’s being mirrored haha. You’ll see when you try it, just don’t glue anything down right away! Good luck and have fun!