I need to make a 4'x4'x4' box, plywood on the sides, and a clear surface on top. There will be a dancer dancing on the box. I am thinking of using 3/4" cast acrylic, should I be using a different material or thickness? I can get plexiglass up to 1" from McMaster. I am also thinking of putting 2 support columns (1.5" aluminum pipe) in the box to support the center, but would prefer not to. Worst case scenario, will the plexiglass "shatter" or break through? If I have the pipes in there and the dancer breaks through, he might impale himself on the pipes (no fun!!). The dancer is 180lbs, and he will be tap dancing. Any help appreciated. Thanks!