Nice Work. The only thing I can think of is that you might want to line it with something. You'll probably get some debris collecting in the nooks and cranny's of that wood. Also, you may find yourself accidentally blasting the inside walls and having them fall apart. Just a thought.
When I tried soda blasting, I used a cardboard box lined with a trash bag as my cabinet. I was on my back deck and the soda killed the weeds growing underneath.. Bonus.