Prefab Champion

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Across
  1. 4. Building method involving off-site construction (10 letters)
  2. 6. The process of putting together parts (8 letters)
Down
  1. 1. The place where prefabricated components are assembled (7 letters)
  2. 2. Prefabrication helps in improving this aspect of construction (10 letters)
  3. 3. Type of construction that is environmentally friendly (11 letters)
  4. 5. Another term for prefabricated buildings (7 letters)