Here's an interview with producer Rosa Tran via The Film Stage.
“We were working together at Starburns Industries and wondering, ‘what’s the next project?’” recalled Tran. “Duke got a hold of [Kaufman’s] script from Dino [Stamatopoulos] and immediately wanted to make it.” When they initially pitched the project at various studios they were either rejected or told to turn it into an episodic format that could be aired on television.
Huh! Didn't know that.
“I got involved in animation and it was like something clicked,” Tran said. “I call it the animation bug. You go onto a stage and it is beautiful.” She specifically tells the story of her days on the long-running stop-motion animated TV show Robot Chicken and how they had a Star Wars special. “You go onto the stage and there’s the scene where the AT-ATs are crossing over this icy terrain and I’m looking at the AT-ATs on this 20 by 20 set,” Tran noted. “I look at the computer monitor and I look back and forth and it’s like a magic trick. The snow is perfect. The AT-ATs are perfect. The little stormtroopers are perfect. When you look on the screen, it’s like the movie. The small details are so amazing.” (Source)