Tell us about yourself!
It's not a toy for children. It's a survival tool for adults and responsible people. So, while your comment is technically correct, no one has any business putting their hands in that area. Also, a shield would be simple to construct. This guy didn't make a shield because... he's a responsible adult.
Cool instructable! In addition to hyperspin, there is also MAME, which emulates actual arcade machines.Also, you could take a magic marker (felt pen) and color the inside of the speaker holes. The wood color throws it off a bit.