ROTFLOL - I just loved your Gandalf imagery.
I think I'll see how the model behaves if we consider the tower to be free to move, i.e. it will not resist any side load. If it works, we just don't worry about bracing the tower, we let the logs slide over the ones below and the tower will end up looking something like Gordon's stack of pallets. Not quite the pile of rubbish you envisioned, I'm afraid.
For those unfamiliar with newsgroup/chat room shorthand ROTFLOL is "rolling on the floor laughing out loud".
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