Making a Fighter/Rogue/Sorcerer decent

[Harbinger]

Yes, Nale gets made fun of for doing this, but I'm wondering if it's possible to make it work well, or at least decent. How much of each class would there be? For the purposes of this lets say... 12th level?

[Flickerdart]

A fighter dip can be useful when qualifying for Swiftblade. A rogue dip might be useful when getting into Unseen Seer. I don't know why you'd want to do both at once, but you would have 1 level of each and then get on with being a sorcerer because it's way better than what you had going on before.