You know, I'm personally against faction-switching but... I don't know, this actuallly seems thought out. I would ask, however, if the Jedi/Sith abilities would remain the same.
Just something that's been bugging me for a bit. I would assume they are (all life being sacred and all that), but I don't think I've ever come across any material confirming it.
I am a roleplayer, but I tend to just use my own personality in the class quest, simply because most of my characters wouldn't be doing half the class quest stuff in the first place.