Towers

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