It differs from your question in that there was definitely a framing story run through it, but the only pre-2000 art book I can think of that had a scrapbook look was Tour of the Universe: The Journey of a Lifetime: The Recorded Diaries of Leio Scott and Caroline LuranskiTour of the Universe: The Journey of a Lifetime: The Recorded Diaries of Leio Scott and Caroline Luranski (1980) by Malcolm Edwards and Robert Holdstock.
It's slightly larger than an A4/8.5x11 sheet of paper, maybe 22cm by 29cm - larger than a normal hardcover, but not as big as the large-format art books like Spacecraft 2000-2100AD.
The book is presented as the scrapbook of a couple who won a galactic cruise, and includes newspaper clippings, advertisements for attractions, pictures that they took, tickets, boarding passes and a detailed cut-away drawing of their cruise ship.
(Sources: Terran Trade Authority site: "Tour of the Universe", We Are the Mutants site: "Earth Visitor’s Passport: ‘Tour of the Universe’, 1980")