I used the plywood crate a mill drill came in. Caulked the seams, painted the
inside white. added cleats for expanded metal floor to hold projects above the
upside down pyrimide that funnels the sand back to the hopper. Used 2 x2 for
legs.
The opening is covered with window glass sealed with foam weather strip. I did
buy a dust collector type vaccum for the dust because I use it mosty for
removing rust. That and sand silca dust is bad for the lungs.