nahh you could go another 1/2" easy, the way the UAII is setup there is a small flat spot one the fronts of the top two pieces of the control panel sides, it will accept larger and look fine. The only thing to keep in mind is that this UAII is HUGE, so don't go to large on your CP height because it will rapidly become uncomfortable to play with. I'm 6'1" and 5 1/2" is about as large as I would want to go, I doubt seriously the other 1/2" will matter though.