Once that was down we stacked the first round, bark down, propped up along that bottom circle so that they are leaning in. This is the trick to the stability of this kind of stack, as long as the logs are tilted in, if they slide or fall a little, they just fall in on themselves, making it more sturdy. When you have a few rounds down, you fill the center up. As I said, we mostly just tossed them in, although we did check now and then to make sure the gaps were filled.
So there you go, just in case you ever need to stack a holzmiete. (Hey, you never know)