Never really delt with it.... would a machine shop do this sort of thing, or an engine performance shop. Would you trust a "piston only" shop to do the balancing?

What all really gets balanced.... rotors, e-shaft, flywheel, PP & clutch? Anything else really?

 

Any balancing shop can do it. There are some custom 'dummy' weights that are needed so its best to find a shop that has done it before.
As for what gets balanced, just look at everything that spins with the eshaft. From the front pully to the flywheel and pressure plate. Don't worry about the clutch disc, it changes position everytime you shift.

 

The deal with the dummy weights (or bob weights) is they have to account for the rotor plus the weight of the oil that is trapped inside as it spins.

That's why it's best to have a rotary experienced shop do it.

 

i would only trust a rotary shop to do the balancing, this is completely different physics than boinger engines so have the right shop do the right work.