In the days of computers, i-pads, and cell phones, I don't know how popular a doodle maker will be, but they were a very popular pass time, back in the 80's (remember the Spirograph). Toy makers put out many plastic geared versions back then, that often turned up under the xmas tree. This wood version is fully automatic, give the drawing table a push and see what you get. The construction looks difficult but it is not, I would class this as another easy project.
Designed by Nick Engler and built by Adam Blake it was in the 1988 Popular Science Projects Yearbook.