I think they had already started working on a Duck Dodgers movie of sorts years ago (not sure if it was for theatrical release of not) before they decided to make it into a tv series instead. I remember seeing a behind the scenes clip that showed some preliminary pencil tests and at least one finished scene that looked a lot higher quality than the tv show. Actually a lot of those pencil test clips were recycled and used during the opening intro credits.
I'd love if that was finished and released, even if only straight to video. I'd totally buy the hell out of it!