All slingshots on this page have bent wire fork ends (like most commercial slingshots have), with flatbands fastened to them with strong rubber bands. This method works very well, and I higly recommend it for all who use a commercial slingshot and want to try flatbands on it.
A Saunders Falcon 300 from the 70ies, rigged with flat bands
Crosman Vortex, also equipped with flatbands. Not the cupped pouch.
A very nice "starship" with extended forks.
These bent-wire slingshots are relatively easy to make by using string to form a "spainish windlass" to bend the aluminum rod.They fit the hand surprisingly well!
Not a slingshot, but have a look at the double cupped pouch with its two holes. These pouches make reloading very fast and easy. Their impact on accuracy is discussed in the slingshot community - so far, there is no evidence these pouches are inherently more or less accurate than normal ones.