Diet's "Custom ergonomic" uses quite a lot of complicated wooden parts. You should know a thing or two about woodworking and metal bending before you attemp to copy it, but if you succeed, you'll be rewarded with a great-looking and great-shooting slingshot. The long brace gives you a good leverage against the pull, the heavy weight improves accuracy and the fork extension adds power.
The pictures are pretty self-explaining: Bend a 120cm steel rod in shape, construct the wooden parts. The two handle halves are connected with wooden dowels and the metal frame ist painted and two Barnett fork tip protectors are pushed onto the fork ends.
