Have some 6 ply laminate that was in the scrap pile, added some grip thickness and a sweet little shooter. Most of the slingshot I have made extend beyond my palm like a hammer or pistol grip. This laminate had a groove in the back so I made it much shorter than I normally would.
This sits right in the middle of my palm. I was going to ask why folks were making frames that were so small and skinny. B u t now I think I understand.
It looks like it would be comfortable to shoot with a thumb and forefinger brace grip as well as the hammer grip.
I first I thought your #64s were configured 2X2X1. That's a hard hitting combo for a long draw. But my second look has me thinking it's 2 links of braided #64s (same amount of rubber but half the length) and one at the pouch. That should work well with a little less draw length. Clever!