I'm looking at this again and contemplating that there are a lot of crevices created at the shoulder area when moving about.
It seems there would be enough vacuum in that hood to draw in some silica dust and even rust. I'm thinking a better sealed system would be required even for any blast media. Well, at least to continue blasting for many more happy years. I know I'm not alone on this, but I breathed all of the rust I care to, even with a respirator. It looks like someone with the resources and ingenuity could do well even selling at decent affordable prices. Moreso probably.