I’m trying to remember a large (not a lot of pages, but physically the book was big) illustrated book. It was mainly drawings, with a little bit of text on the pages. It probably had a soft cover. There was some kind of inventor who had some contraptions, including at least one flying machine. Something bad happened at the end, there may have been some kind of disaster, the guy was really unhappy. It may have been some kind of activity book, with some perforated parts you could punch out? It would have been published no later than 1985, when I was 7. I’m guessing it was at least a few years earlier than that. I’ve been trying to think of this for years, so any help is appreciated.