AARON - Nice Blast cabinent. I was thinking of maybe making Mine a foot wider. Several yrs ago as I was driving to work pondering how to get the width I wanted and still get enough slope to the bottom to get the media to drain out of the hopper, I passed a semi, pulling a double-hopper grain trailer. There would have to be two doors on the bottom, but if You wanted to, You could make a cabinent as long as You wanted with more hoppers. I also planned on two pairs of gloves.
Steel is getting CHEAP again, Maybe this summer. You look at what a factory-built blast cabinent that size would cost and You can build one and save the price of a nice MIG welder in the process.
Your comment about sand is VERY true, old co-worker of Mine made a small blast cabinent out of plywood, Guy was VERY FRUGAL...He'd try to reuse sand as many as three times, dust was so bad He couldn't even SEE the part He was blasting.