This weekend, I baked a batch of John's 'Take 1' recipe, his recipe and photo here. The cookies I baked were just as stackable as the original guerrilla cookie, if a little thinner.
The first batch I baked, after letting the dough rest for only about a half an hour, had little holes on the surface. I think the cookie would have done better if the binding dough baked up a little more cake-like.
I refrigerated the dough overnight and got slightly better texture (stack on the right, below--a little overbaked.) I added a few tablespoons of oat flour to the remaining dough and got the cookie stacked on the left, below. The extra flour achieved a more cake-like cookie and cut some of the extra sweetness, but ruined the nice flat profile.