I've done it, though I honestly don't remember if I finished the game (it was a while ago). Still, I got pretty far.
A few suggestions:
While your focus should be on spellcasting, you also want to be formidable in a melee. You don't need to add in other classes to do this, just be the right race with the right equipment.
I'd recomend Drow for your race, and dual wield short swords and daggers. The stats should look something like this:
STR 12
DEX 20
CON 16
INT 6
WIS 6
CHA 20
At first, you want to get the weapon finesse, two weapon fighting, and ambidextry feats. This will give you an extra attack and +5 to hit early on. Supplement your dual blades with a bow, and you won't need to rely on magic in the early game. As you progress, gradually transition into the sorcerer that you are. Take feats like Spirit of Flame and Spell penetration. Continue increasing your charisma for more spells, and don't overlook the defensive enchantments. Your goal is to have a very high AC, combined with stoneskin, both fireshields, shield, and mirror image. When you have this defensive array, you can blast away with AoE spells all day long, or cast Tenser's Transformation to turn into a warrior.
Also, it helps to have beaten the game already if you havent )
Good luck!
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