Well, here is my dome tower. It was easy at first, until I got to the part of removing doubles, because I’m using 3.0 and that option changed to Merge by Distance… and honestly, you should explain a bit better what that option does. It took me a while to understand how it works and find the right distance to remove just the doubles (0.1 m). But it worked out in the end.
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Well done sorting it out. Sometimes students do not make the two parts in the same object, so the verts can’t merge. Merge by distance is at default exceedingly tiny or no distance apart!