Home made sandblast cabinets..lets see them

I am thinking it is a combo of 2 things. The angle is not steep enough. The pic in the post almost has it at a 45 degree angle.
The more involved seems to be that your cabinet is narrower. If you change the angle more, the positioning would be more natural, but then the narrow front to back might limit things.

What about changing the angle?
--put the arms into the vertical face of the freezer, and put your sight glass in the top. You could have the edge of the lid at sternum level, arm holes in a natural position standing up, and the viewing port as close to the edge (opposite hinge) as possible?