As an example, my cab is on casters with a full 1" clearance. Here you can see it on a pretty low-pile carpet. And it doesn't even have all of the panels installed on it or the monitor, and there's no computer, speakers, or glass installed. No coin door yet either. So this thing is going to get even heavier. If you look at the back there's a bit more clearance between the carpet and the panel -- maybe up to 1/2". Its pretty front-heavy right now because my control panel is very heavy. Far heavier than a typical control panel. But as you can see, an inch of clearance disappears pretty quickly on carpet. Importantly, though, as is hopefully apparent from the picture on concrete, an inch of clearance looks just fine on a hard floor too. So I'd say, even if the thing will never, ever be on anything but hard floors, go at least 1/2" on your casters. Maybe more.