What CJ is unable to say eloquently is that Iron Heart is a great discipline and you'd do well to pick some things up from it. Iron Heart Surge is pretty necessary for tanking since it means you can say "screw you" to debilitating effects, although you'll want to be reasonable with it and not do silly stuff like Iron Heart Surge away the moon because you don't like it. Wall of Blades could outstrip your own AC. Dazing Strike could later be pretty decent for your build since the DC against the daze effect is based on your strength modifier.
Tiger Claw has a few useful things, depending on how you want to tank and what your setup is. Sudden Leap can help initiate charges with the
Battle Jump feat which you could then use Power Attack, Improved Bull Rush,
Knockback, and
Shock Trooper with to knock enemies around and deal great damage to them, plus it makes you a big target to be using battlefield control. Flesh Ripper might be called tanky since it lowers your enemy's AC and hit chance.
TWF is bad unless you have a lot of extra damage like sneak attack or you go into something like Bloodclaw Master or have the Multiheaded template from Savage Species. Even if you did have something like sneak attack, Oversized TWF is a bad feat because it will only get you 1 or 2 extra damage on your off hand when instead you could be going for something like Power Attack, Improved Bull Rush, Knockback, and Shock Trooper on a 2h build. Yes, they're being repeated, and that's because that setup is worth being repeated since it's a great combo. You'd also save money on only enchanting one weapon.
The general consensus on Powerful Build is that it does not allow using a 2h weapon of your size category in one hand, even at the usual -2 to attack rolls for being inappropriately sized. Your DM might rule otherwise since it wouldn't be unreasonable to allow it, but as mentioned going TWF won't benefit you as much as simply going 2h.
Cleave is generally a poor feat because it's so situational. Unless you expect to face a lot of mooks you should avoid it.
Are you using Unearthed Arcana at all? There are rules int it to let you buy off the goliath's LA since, as the book roughly says: "The abilities gained from level adjustment tend to matter less overall as the character levels up."
Speaking of UA, are flaws allowed? You could get the feats you need to be more tanky (lockdown/smackaround route) by having flaws.
If you're going for a lockdown tank route then I'd suggest a guisarme and armor spikes instead of a greatsword so you can threaten at a distance and make AoOs. You could make great use of Combat Reflexes with that Dex of yours.