I'd say this belongs in the min/max forum, and you'll definitely get more replies there I think. The hour-glass eyes were supposed to be a curse, so you might just ask the DM to work with you on that. Other than that, I think Raistlin was basically just a human wizard with a low con and strength, and high dex and int, with some cross-class ranks in Sleight of Hand. There are dragonlance campaign books with prestige classes for wizards of the towers (or whatever they're called). He'd almost certainly have levels in the black robe one later in his career.