Love the idea TAG! I too suffer from SSSSAS (Sling Shot Shooter's Short Attention Span) and having a bevy of targets is a great way to stay focused. I don't use a catchbox much, but I do like the idea of having a little shooting range with zip ties and different sized stickers/cards attached. I'm with GG though, don't think I'd be able to hit them at this point.
I figure it can’t hurt to shoot at small targets, it doesn’t cost any more to miss as it does to hit the target. At my age it’s a race against the clock to see how accurate I can get with a slingshot before eyesight deteriorates. Slingshots is the only sport I have ever participated in that I no longer get upset with myself.