Still.. Building a char solely for d clone hunting is a bit pointless. A lot of pvp chars can solo him.
It IS pointless to build a character for specifically killing DC. My freezadin is built for general PvM (with the right gear switch he can be a decent PvP albiet a bit BM) but he tanks DClone easilly under a minute even without a PMH mod (maybe not as fast as some but wasn't even decked out in his best gear and I was still using a lightsabre at the time) and never needs even a potion.
If you're having trouble killing the Clone there are a multitude of guides that can help you but if you're a pvm melee character, life tap is your friend. Get some dracs, throw on a GA, laugh at anything he throws at you and you'll chew him up. Don't make an IK barb because you think its the best at killing DClone. Its not by a long shot. If you want to make an IK barb make it because you want an IK barb.
However, if your question was "I want an IK Barb but one that can be tough enough to also tackle the DC. How can I make one?"
That guide is decent for a basic pvm IK Barb. Its pretty standard though some might suggest different amulets or tinker around a little with some of the other things but all around not bad.