i really like this build.

I often skip the glacial shroud, depending on the opponents and how much damage they deal. Iby it after Frozen Mallet or I skip it completly and get Nashors or Rageblad (i mostly by Nashors, i like it more than Rageblad and after Nashors is finished the games are also) Most of the times i start with ninja tabis and ruby crystal.
The slow of Q and frozen Mallet is amazing and with frozen heart the opponents cant do anything but die :)

Excellent build! It's rather expensive but once past Trinity force it's really easy to cream even the most powerful of champs. Great Job!