I really like the choice of tacks you used on there, with the diamond shape. They give it a nice rustic look, along with the natural colour variations in the leather.

What was your process for installing the tacks? Did you just drive them into the leather and wood with a hammer? Or did you drill small pilot holes, use any supporting glue, etc.?

One of the things I'm concerned about when my (future) targe project gets to the point of installing the tacks is that I'll end up bending a lot of the tack posts trying to drive them into plywood. I had that problem in the past with a furniture project. As I'd try to tap a tack through the fabric and into the wood behind it, the post would often bend ever-so-slightly or drive into the wood at a slight angle, and the tack would end up off-center. Drilling tiny pilot holes would seem to help, but would be quite a pain. So I'm curious what you did.