Work has begun on the construction of one of Vietnam's biggest textile and dyeing facilities, which will be based in the central city of Da Nang and is due to be completed by the end of next year.   The VND641 billion (US$42 million) Son Tra complex, the first of its kind in the central region, will consist of three facilities for textile making, dyeing and water treatment. All will be equipped with modern technology and equipment giving an annual productivity of 15 million metres of fabrics and 25 million metres of dyed material, and 5,000 cubic metres a day through the water treatment plant.