Building paper airplane models was a very popular hobby in Israel (and probably other countries) during the 1960's. Each issue of the Israeli Air Force Journal came with a model which you would painstakingly cut and glue. Here are some examples of what these models looked like: http://starry-side.com/wpe/wordpress/index.php/2019/08/08/ol... Of course, this guy is on a whole different level of detail and dedication (plus he designs everything himself). Amazing work.