https://www.theslingshotforum.com/slingshots/the-recycled-switchblade-118.html While not entirely a "homemade" per se, I wanted to show this little devil to you all here to see what you think. It is made from a scrapped knife I've had for years and didn't want to throw away. I know what you're thinking, and it is pretty flimsy looking, but it's actually quite the shooter. I wouldn't trust putting too much rubber on it, as the metal scales used for the fork will probably just bend in half over time, but with light ammo and a fairly decent band set, it's a pretty fun time. The forks are adjustable to some extent (see pictures), and the frame is actually quite sturdy for being almost completely flat (again, not using anything too heavy).