Have you ever had an open air case? Dust doesn't get trapped like a normal case.
No they don't. I've run 5 open air rigs since 2008 in various cases and 3 different states/houses/environments. They don't accumulate dust. And if they did, a 10 second blast of compressed air is all that would be needed and you wouldn't even have to unscrew or remove a single part to do it. Just point and shoot.
I have to admit I am very drawn to the aesthetics of this case. I just wish that for its size it was dual system as I said before. If it was with 3x480 + 2x360 rad support and under $300 we would have a hands down winner vs the Elite and 1000D IMHO.