The board hung the wrong way round. Its width ran in X while the bracket
projected in Z, so the sign stuck out sideways from the end of the arm --
which is not how an inn sign hangs. The arm comes out from the post and the
board hangs UNDER it, in line with it, so it faces the road both ways and
can be read walking past. Everything that positions the board, its battens,
its lugs and its chains moves from one axis to the other, and it swings
about the arm's own axis now rather than across it.
Turning it the right way also removed a piece. The cross-bar existed
because two chains set either side of a centre-line arm passed it on both
sides and touched nothing; with the board in line, the chains hang from two
points ALONG the arm and the arm is the cross-bar. The note explaining why
that piece had to exist is worth keeping in the history: it was a correct
fix to a problem that only existed because of the orientation.
28 models, 20 667 triangles, all checks pass, 0 floating cases, GLB
round-trip clean, Conformant, build clean.