Towers

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