I occasionally build custom slingshots, here are two I've made in the last year - one for a guy back east another for a guy in Germany. Each one is made from different woods as well as homemade micarta for the scales on the "Liberty" and for the core of "Die Urutu". I haven't sold any yet, each of the builds are for gifts or for trades of builds by others around the world. It's fun hobby, but one I don't spend a lot of time on.