This a pin hole camera than is to be cut out of 5mm MDF/Ply. It is un-prototyped so I cannot say if it works.
Lazzor it, try to fit it together, it has to be snug, but some sanding may be needed. Fix the shutter (tear drop thing) on with a screw and place a piece of card or metal with a pin hole in the middle behind the big hole.
In a dark room, put in some paper, close it up, seal it with electrical tape and get shooting. It should take a few seconds for each shot if you are outside. I think.