[Bruceb]

We did this last year...sort of. We took the impellers from 2 shop vacs and stacked them so the ouput of the first one fed the input of the second one.
We powered them with 2 FP motors. You might get away with one this year as it is a lot more powerfull than last years. Don't know if it wll give you enough suck though. Do some trials with the vac plugged into the wall and see if you get enough. I tried this early on and didn't think it would give us enough control and the game piece was easily knocked off. Hope it works out for ya. Would be cool to see.
Bruce