3.2 Deathcoil spam build?

The main point of this build is to launch a crap load of deathcoils and take full advantage of the new Unholy Blight.  Between Scent of Blood and Butchery, you generate a ton of runic power to dump.  Then add in all of the free deathcoils you get from Sudden Doom, and you're looking at a recipe for more deathcoils than you can handle. 

This is also synergistic with the new resilience nerfs/buffs (however you look at it), letting dots do more damage relative to normal attacks.

Thoughts?

As a none-deathknight I'm a little intimidated but have a few questions seeing as I'm not too familiar with the Runic Power generation etc.

If you'd be within melee range of a target, popping your runes and all, how often and how long would DC be castable? And how about when you're out of range, but using other runic power generating skills? As a warlock I still cry in my sleep from time to time, reminding the Icy Touch spam a few months back. It would be nice of you to elaborate on these question, and GL on the PTR