The Facilities Planning Office has posted a generous number of plans, elevations and perspectives of the McLaughlin dormitories.   In plan, at least, the composition looks quite a bit like an Oxford-style quadrangle, and each of the four interior angles is even made a bit different from its neighbors.   The axial landscaping and the emphasis on the central building in each trio, however, will probably make these dormitories evoke Ripley, Woodward and Smith Halls at Dartmouth more than any quad.