in your answer to Jeffreys question you had doubts about projection from the
grid. You wondered there might be a better way to do so. I don't really know
a better way, but I once participated in a dance performance with projection
of photo images on to the dancers and the backdrop. This was done, by using
a projector and a mirror. This mirror made it possible to project images to
the backdrop as well as to the floor (and on the dancers). Maybe an
experiment with mirrors could help you any further.
Bye,
Carolien Bastiaans
student theatre, film and television studies at Utrecht University