Mad3: If it is better to go 1 or 2 handed depends (among others) if you go for epic divine might.
Your class combo looks great for this and then a 1 hand weapon + shield would be perfect.
High armor class and tons of damage, especially with weapon and armor you craft and enchant yourself.
Can a DC raise charisma as an epic feat? This would be even better.
I have never played a paladin in NWN2.
The holy avenger is a sword you get in the OC, right?
If so, it does not matter for MotB, because you lose your weapon when you import your char to MotB.
Your OC (or any other campaign I guess) char will keep all equipment except the weapon when you import him to MotB.
The build I am planning gets Epic Divine Might at level 21.
DCs can choose Great Charisma as an epic feat.
Yes, the reason I was thinking of going with Weapon Focus in Longsword is for the Holy Avenger in the OC. More of a traditional paladin type.