Experiment.

In this video the same apparatus was assembled onto a larger space, however the clarity of the projection was of poor quality due to being exposed to large amounts of sunlight.

Ultimately, though, the desired effect was created as the subject's shadow was dis-concordant with their projected image, as expressed in Peter Campus' piece.

It may be helpful to created a darker environment for the projection in order to created a clearer portrayal of the subject, once this is achieved I believe that the results will be pleasing.