No, you found the right thread, but the wrong spot and therefore the wrong discussion. You probably found page 33, e.g. (where it is about my explanation why it cannot be solved "classically" here). I also found that earlier while searching and therefore thought I had found the wrong thread, because that does not suit your question well. But we would have only needed to scroll further back: in the same thread makes a suggestion in post #176 on how it can be solved after all, and this suggestion is what I meant: You want something like in post #175 upper picture. What is shown in post #175 lower picture you do not want, like the OP there (concrete precast part as a downward open U, walls on both sides carry the roof). And on this says the following: exactly such a precast part is indeed suitable if you open the U to the side, i.e. turn it 90° as shown in the lower picture. Then for example the "roof" becomes the "right side," the "left side" becomes the roof, and the "right side" becomes the step in front of the door (or runs underground if you don’t want a step in front of the door, but also there in that hidden place it retains its full static function, contributing successfully to the tensioning of the whole thing). So it only hides itself at first glance, but is already the solution nonetheless