Drizzt is a barbarian so he can dual wield
Hooray! Suggest a pair of "Strength" Rune worded Cutlasses!
_Vitality - none allowed_
Check.
_Vitality - min. of 1 point per Lvl. - Drizzt is not a wizard, but does posess a small amount of magical power. _
You mean Energy, I am sure.

Check.
_To wear chainmail and above (light plate being excepted), he must possess 1.25 the required strength, because elves are lithe, not muscular. The same applies to any full helm or greater_
Alternatively, don't allow certain head gear, stick to the lighter stuff: helms, circlets, skull caps, or nothing, but it's your baby.
_Weapons - He may not dual-wield 2-handed swords - they are too awkward. Also, because he is a speed-oriented fighter, he may not use any weapon with less than a "fast" attack rating. Drizzt may not use a shield_
Hmmmm, puzzling. See below with all six masteries. Where do Spear and pole arms fit into this? Most spear class weapons are lower than fast, (save rares and Uniques) and polearms are exclusively two-handed and certainly more awkward to wield than a 2 H sword. ???? Might want to rethink that, even though I am all for using polearms like grim scythes and such. What about double throw and throwing? He is very dextrous. Also, he is a ranger, what about Weapon II being a Bow? No cross bows?
Combat Masteries Tree
_Sword Mastery (naturally): In order to raise sword mastery past Lvl. 5, Drizzt must first spend at least a single point into all other weapon masteries_
See above. Pole Arm and does not seem to fit, though Spears might.
Warcries Tree
_Only Howl and Taunt seem appropriate, due to a drow's effect on enemy troops when they see him in action, and the fact that Drizzt taunts his enemies into attacking him on several occasions. None are required, however_
Awe, no Grim Ward? What happened to him being a bit of a magician, if no wizard? And he is scary, some times, being a Drow.
Combat skills Tree
_DS - minimum of Lvl. 5 by Level 70. Should be self-explanatory_
Given 1.10 symmetry, can he use Bash to boost the damage from symmetry but not use Bash as an attack?
_L/LA - Drow nobles can levitate themselves through sheer willpower. However, this skill is not required to be pumped, as Drizzt slowly lost him ability to levitate once he came to the overworld_
Drizzt is very acrobatic, he jump and flies through the air. I'd suggest No restriction on either of these. Your call, of course.
_Berserk - Optional: may only be used against act bosses and specific drizzt quest bosses, except where noted otherwise_
If he goes Frenzy and it is 1.10, Berserk is a nice damage booster to Frenzy. Adds magical damage, which is nice I think.
DRizzt looks pretty darned good, Bruce, goodonya!
So, since there are not red heads in the game, is Cata Brie an Amazon or an Assassin?
