Making a powerful slingshot - a complete tutorial for birch plywood slingshots

Tutorial for homemade birch plywood slingshots (catapults). Concise step-by-step instructions on designing and making a powerful flat band slingshot with relatively basic tools (jigsaw, electric drill, basic drill stand, a vise, a coarse rasp, files, 150 and 320 grit sandpaper). The tutorial also shows how to cut flat bands and make leather pouches, and how to attach flat bands to the pouch and the slingshot forks. If you prefer shooting rocks, allow for a fork depth of at least 4 cm (roughly 1.5 inches),