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Message: [QUOTE="sutomcat, post: 3363963, member: 27"] I agree. This is the mistake I made on the north side. For the east, west, and diagonal walls, the girders are aligned exactly with the columns. There is always a vertical spiral. There is a clean 1:1 correlation between columns and girders. For the north and south walls, they use a different setup. The spirals are all diagonal and they meet in the middle of each column. So when the last upside down (arrowhead) is completed, there will be a gap for one girder on both sides of it. [/QUOTE]