For the 1997 testbeam, you can find:
A description of the geometry of
the WA98 detector as well as a drawing
of one quadrant. There is also a text file describing the mapping of channel number in
the WA98 data to theta and phi.
A description of various mounts along
with lots of pictures.
A description of some of the problems
encountered with the telescope data in 1996 is here.
