Towers

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Across
  1. 3. under supporting structure
  2. 5. road designer
  3. 7. very tightly stretched
  4. 10. structure on top
  5. 11. how long side-to-side
Down
  1. 1. center locking point
  2. 2. supporting extensions
  3. 4. supporting wooden triangle
  4. 6. being pushed down
  5. 8. supportive structure
  6. 9. curved/symmetrical