haven't made one but I've got a couple

Actually got a few all leather slings.
One really nice woven/braided one from a guy in sweden I believe I swapped for a box of hardwood scales.
And a really small thin one - possibly from lithunia, although that might have been someone else.
The best one piece is from tomas

But then the guys a serious learther worker - so what else would you expect

It's a real heavy duty beast too !