friend, you may want to rethink the idea of having arms rest on your treestand for bowhunting. On a steep down angle shot to the side, they just may get in your way or force you to hang out over it. You would be better served (and you should) using your money for a good quality body harness and lifeline.
The safest treestand I ever had was a tree lounge. Problem was it was too darn comfy. I almost always ended up falling a sleep in the darn thing.