This is a work book designed to accompany a practical project for year 7 or perhaps 8.
It invloves cuting out fish shapes with a coping saw, drilling a 4mm hole (for the eye!) and inserting a piece of steel rod for magnetism.
I am using 2 sheets glued together to reduce breakage.
There is also an interlocking box which could be cut out of ply or MDF. And a rod with a magnet.