Ground Zero Plan Seems to Circle Back
Daniel Libeskind's design for World Trade Center site undergoes scores of changes, both major and minor, and its secretive evolution contrasts sharply with continuing portrayal of rebuilding process as one of most open and inclusive civil building projects in memory; many officials think new design is reminiscent of one rejected by thousands of citizen planners in 2002; changes are response to financial considerations of Port Authority of New York and New Jersey and developer Larry A Silverstein, as well as political needs of Gov George E Pataki; concerns of victim's families about memorial sites, transportation needs, street grids and even personal egos also contribute to redesign; drawings (L)