A while back I made an experimental looper slingshot that's been a lot of fun but now for the first time I've tried it as a slingbow. I haven't altered it to shoot arrows specifically although if I wanted to I could make some bands that were more suited to arrow fitment. But for now I've just been experimenting with it as is.
Initial experiments show that it seems to be about as strong as a 20-30lb draw bow using standard 30" cheapo arrows. I can't say much about accuracy yet as I've not had the opportunity to really test it for more than about a dozen shots at fairly close range but so far it works very well.
I didn't have a slingshot with a wrist support to experiment with but the bent wire configuration of this homemade jobbie just happened to lend itself to arrow use quite readily. You can hold the whole thing loaded up with an arrow in one hand and have your other hand free until you want to shoot it.
At the moment it shoots normal length arrows which works fine but it's a bit awkward carrying around a handful of standard length arrows so I have plans to convert it to use shorter arrows for better portability, but that will be later. For now it's a rater fun arrow flinger and I shall be experimenting with different bands etc.