Unholy would be very difficult for boxing because you need to manage a fair bit more than you do with Blood or Frost.

I would focus on abilities that are 1 Rune in cost, and then using a macro to set your camera view with a static position so that you can cast Death and Decay.

I'll need to grab my macro's from in game in a bit, but I'll come back to the thread when I get in game tonight.