hey! today I just finished making my knife slingshot! it to ages and was really hard to make but I think that it was worth it! the slingshot is made out of multiplex ply, oak, thin ply, and Some acrylic. the knife it's made from some 3 mm knife making carbon steel that I have heat treated up to about 50-60 rw the knife is held into the handle by 2 strong magnets!