With what I used to do, I always used thicker ones, as that is what you find on the old guns.
However, as for strength, this thin one is stronger than you need. For a test, just try to break it in two with just your fingers.
I have seen some thin ones on some southern mountain rifles, basically just a folded piece of sheet metal.
That said, if I was going to build something, I'd use something thicker, like Dave suggests.
John