I made that bow from a hickory stave, with a hickory handle block, and backed it with rattlesnake skin. Hickory doesn't really need any backing. That particular bow is aprox. 75 pounds draw weight.
I want to try to make an Assyrian Horse Bow from horn and sinew, but I haven't gotten around to it, yet.
I make rabbit sticks, atlatls and slings as well.