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Kyle,
When I was a kid, my Dad restored a '41 Indian much like you are doing; he built a booth out of 2x4s and plywood and covered it with plastic sheeting. The whole thing was about 4'x8', built against 2 walls with one having a window w/fan, simple stand in the middle built on a sloped sheet of plywood to collect debris/sand at the front. We kids got the job of manually sifting the sand for re-use. He built a hopper that fed to a simle siphon feed unit; blast till empty, then scoop and sift and go again. I forget what exactly he used for gloves, but they were attached to a thin piece of plywood with 2 holes cut. When the plastic got a bit cloudy, he just ripped it down and staple up new. The whole system worked quite well.
You might look into using some other media than plain sand (walnut shells is common), if you are able to recover and reuse then the cost won't be so much, plus it's safer dust-wise and easier on the parts.
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