I'll add one more layer on bottom and one more on top, both finished. The top layer will likely be colored brown and then will apply a liquid cement sealer over it. Overall thickness ends up around 1". It's strong enough to walk on now, but if I step in certain places it might crack a bit, so I won't walk in it til it gets at least a second coat. This first layer could probably take the snow load and get through the next winter just fine though.
The rebar I used was the standard width they have at home Depot. Not sure the width off the top of my head, but I think around $10 a piece. Wasn't the thinner gauge... But I've done several structures like this with just the lathe and remesh and no rebar at all. It's still super strong, it just takes a little more expertise applying the mortar so that the remesh doesn't collapse under the weight (which had happened to me b4 too).