Edition: U.S. / Global  Township Squatters Build, Bit by Bit  By
CHRISTOPHER S. WREN, Special to The New York Times Published:
March 31, 1991  Edith Silayi, her worn brown sweater snugly
fastened with a safety pin, sat hammering a twisted strip of
corrugated metal. Once it took usable shape, the metal would be
added to the roof of her new dwelling.  "You start with one room
so you can put up a bed," Mrs. Silayi explained in Xhosa. "When
you get more material, you put up a kitchen, until you have a
good space."  Mrs. Silayi rented a room for two years in this
crowded black township outside Port Elizabeth. But she has four
children and works irregularly packing crockery for a moving
company at $5.30 a day. So the 40-year-old woman has followed
the example of millions of other black South Africans: She found
a patch of open ground and set to work building a shack. Origin
of the Shortage  "We're not against paying rent, but it should
be affordable rent," Mrs. Silayi said. "The Government stopped
building houses y