I've been drafting a design for a small paint/powder booth as well and one problem I see with simply sucking on the booth's atmosphere with shop vac is that the negative air pressure will undoubtedly draw in unfiltered air through all the cracks in your booth possibly degrading your quality of finish. An answer I'd thought of was to install a large filter (something like a high-end furnace filter) in the roof with a large fan forcing air through it into the booth. The fan shouldn't be strong enough to disturb the powdered surface but the total CFM of both your gun and the ceiling fan should be at least equal, if not a little more, than the CFM draw of your filtration vaccum. Make sense?
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