Thinking about making a new slingshot. Wasn't considering building just a 'regular' slingshot, but hanging around here is infectious lol Anyway, the concept is an aluminum skeleton - simple bent aluminum bar stock (perhaps 3/4" wide by 1/8" thick). Within that skeleton would be a plastic honeycomb to enhance rigidity. Then wrap the skeleton in some layers of homemade micarta as an exterior, enough to allow for working into a good shape for grip and for band attachment. I'd also add an internal ammo store-feed thing, and the handle would be shaped such that a folding wrist brace could be added. It would be solid yet fairly lightweight.