Okay. What I was thinking was that as a class you have predetermined sets of skills like you said. However, what I was meaning by building a class even in a skills based is if you have say swords, axes, bows, magic inherent (such as not needing any powders incantations etc.), then your magic which requires the powders, glyphs, incantations etc.; you can use any of these or any combination of these but it means that you're not learning others. Say you really like using swords and magic inherent. Then you'd essentially create what in other games would be considered a battle mage. Or if you don't like using magic then you use the sword and axe, that's pretty much a warrior class. Even though you could have chosen any of these you've still built yourself a class if a custom one.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf