Descent 2e has some great characters and skills for inspiration. Imperial Assault is basically a mod it seems for Descent 2e, with a few changes.
There is a cool trapper class that would probably work.
Our group would consist of (from our Saga Edition D20 campaign we did):
Inquisitor (Force Lightning and Mukashi Lightsaber Style)
Royal Guard/Emepror's Hand (mix of Echani martial arts and some light force powers)
Elite Stormtrooper (Like Fenn)
Stormcommando (much like yours)
Bounty Hunter (as you said, trapper hunter type)
Officer/Agent (fill in the support role)