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1. In one of the walls in your box facing the projection direction, cut a hole matching the open barrel of the diagonal (without the eyepiece, for now). The hole placement is not critical, but to follow our plan, cut it roughly 2/3 towards one end in the long dimension.

1. In one of the walls in your box facing the projection direction, cut a hole matching the open barrel of the diagonal (without the eyepiece, for now). The hole placement is not critical, but to follow our plan, cut it roughly 2/3 towards one end in the long dimension.