Since 1947, Tokyo-based Gakken has created some of the most sought-after science, music, and engineering kits for kids and adults. This issue lets you build a small 35mm Twin-Lens Reflex (TLR) toy camera, also known as the Gakkenflex.
Instructions in Japanese, but easy to build in about 1 hour. How-To movie is here.
This is no cheap plastic DIY kit. Gakken is a very renowned publisher of these "study" kits. A fun present for any camera enthusiast. See a review here