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It's a great idea, I'll build a couple for myself, but I would add a small filter on one side of the box and a vacuum connector on the other, so that unwanted dust or fumes can be drawn away in a cross draught. With this, you can use the box for small sand blasting jobs on glass or ceramic with an air brush type gun or for spraying toxic paint or chemicals. If you are soldering, you'll need to pull the fumes out before you open the box. A grommet from an auto supplier should seal the airline to the air brush or the soldering iron wire. Split the grommet and fix it under the rim so that you can get the wire or airline through it without taking off the plug or pipe fitting.