Armor skin II and III are +2 AC each, so add 2 AC to your calculations. Noticed Armor Skin II and III are not in your build though. Also passive haste adds +1 more.
You can also take Luck of Heroes as a 1st level feat for 1 more AC.
Build has moderate AC and good HP, but good avoid/conceal to make it hard to hit.
Would recommend getting fighter 12 before barbarian 21, as you can then take both Greater/Epic Weapon Specialization and Melee Weapon Mastery. Also, drop base Str to 14 and raise base Dex to 18 to save 2 points in point buy - get 2 free Int or Con by level 40.
Main issue is damage output is going to be kind of low with a Sword/Board combo - could consider dropping SD and epic dodge for Champion of the Wild to add Dex mod to damage (+16 damage) with every hit. This would also improve AC from COTW passive. Could also consider Scimitar instead of Longsword for better crit range.
Something like this?http://nwn2db.com/build/?263168
- Heavy/Med Armor Specialization are stand-ins for Armor Skin II and III. Lost KD, expose weakness and epic dodge, but gained Epic Weapon Specialization, Elegant Strike and Extend Rage. Gained 2 BAB as well. Put in the missing armor skin feats and took Luck of Heroes at 1st level.
AB should be in the mid-80s with G. Heroism, which is decent.
Doubleweapons with a Str + Dex build is possible, but damage is significantly outclassed by a Str + Cha build with Epic Divine Might (possible with a certain crookweave necklace that gives Perfect TWF and monkey grip). Probably better to build a doubleweapon character once you have that necklace.