I would not suggest a unit that uses a shop vac. They are very noisy and will not keep up with the removal of dust, etc. Look up Eastwood and purchase one with the up-right evacuator unit.
I have a TP tools Skatblast big cabinet and it has the TP tool dust evacuator, it burn up toew to motor, like $90 each in 2 years, I hooked up a $40 dry-vac to it as temporay deal, 5 years alter it still work and not broke like TP tools one did, I imagine the TP tool s unit is the same as Eastwood.
I also have the HF floor model as well, I curently have plastic medai in it, but hardly ever use that anymore, so my thoughts are to use a more agressive media like aluminum oxide for the big Skat blast cabinet and modify the HF cabinet to be better. The Skat balst cabinet used a simple by very effecting lift system, a normal housing electrick box with a light swithc for apower swith then a normal light receptile with a flood light forinterior ligthen, a shortcoming to the HF unit is over time the lifght will crap out, so thiswoulbe a cahp and effective mod, then i may opt for a new foot pedla and gunset up like the Skat blast cabinet has, then it would be a good acessories wise ans the mnuch more expensive Skat cabinet, and my though then is use this cabinet of fine glass for deleicate meadia blasting jobs .
Another alternative is look at TP tools site, they sell a kit with plan for you build a plywood cabninet and they include all the parts needed, besdie the wood. I seen a few folks do this, even line the interior with aluminum, or sheetmetal, and end up with a very nice unit for the fraction of the price of the big Skatblast cabinet.