Dave Filoni does a good job of making the cartoons have that star wars feel, at least a consultant basis with him would probably be a good idea. The empire being the only ones with money isn't true, economics wise it was about the same as the clone wars (well in some cases more prosperous due to poor kids could become solders, and earn a decent living, though aliens had a hard time making a living), but was a less prosperous time in terms of development due to the empire contracted, or forced all innovators to work for them without publicly sharing advances. The movies still had Chewbacca as a rebel (otherwise JDeck is right), and 2 droids C-3po, and R2-D2. Having a droid, or alien being part of the cast promotes the star wars feel. Like rebels half human, but a familiar droid, and alien, along with a new alien, grounds us in star wars, but expands on it. Not a big fan of Rebels myself, but it does a great job in this sense.