Just which toon was Judge Doom?

Rating: Null/10 (5 June 2004)

"Who Framed Roger Rabbit" is one of those rare films ("The Rocky Horror Picture Show" and "Cannibal! The Musical" come to mind) that create their own genres for the simple reason it's impossible to fit them into anything existing.
Raymond Chandler meets Tex Avery? "Chinatown" with a twist of "Red Hot Riding Hood"? Or even hidden commentary on racism in mid 20th Century America? (What the cartoon characters are called, "toon," rhymes with a racist term.) Arguments could be made regarding all these things, but I'd just rather sit back and enjoy the damned film!
I don't think animation ever looked so full and rich, even in the days of classic "full" animation. The cartoon characters interaction with humans seems credible because the toons cast shadows and are drawn to have depth. The beauty of the animation is another factor making this so wonderful a movie.
The range of voices doing those characters is also remarkable: David L. Lander, June Foray, Mel Blanc, Pat Buttram, and Frank Sinatra, not to mention the three main ones, Charles Fleischer (Roger and Benny the Cab), Lou Hirsch (Baby Herman) and Kathleen Turner as Jessica. And, lest we forget, perhaps the most memorable turn, Mae Questyl in the last time she'd ever voice Betty Boop (and the first time she'd done so in over 50 years).
Of course, the human actors are no slouches, either. Despite the light nature of this film, Bob Hoskins's performance as Eddie Valiant ranks with his best work. Christopher Lloyd is also the very embodiment of evil as the appropriately named Judge Doom. And Joanna Cassidy voices the most "un-family film-like" line in the movie ("Tell me, Eddie, is that a rabbit in your pocket, or are you just happy to see me?") with all the world-weary non-chalance it deserves.
Speaking of Judge Doom, I'd like to voice my own opinion about a mystery of the movie.
At the end of the film it's revealed that Judge Doom is the toon who killed Eddie's brother in disguise, but which toon he is isn't ever revealed.

I think Judge Doom was supposed to be Popeye.
Why? When the steam-rollered Judge Doom re-inflates himself with compressed air, his fake eyes "pop" out. He also has the ability to morph his fist into dangerous things like anvils and buzz saws, much like Popeye does after eating spinach. Popeye is also one of the few classic cartoon characters absent from the film, making him a prime candidate to be Doom. Of course, Doom's toon has a high-sqeaky voice and _two_ red eyes, but I think these are miscues to get one off the trail.
Why would they make Judge Doom be Popeye? My understanding is in the original script of "Roger Rabbit," Popeye was supposed to appear along with Bluto as one of Marvin Acme's pallbearers. But Kings Features Syndicate, who owned the rights to the character, wanted too much money to let Popeye to be added to the film, so the script was changed.
Did Zemeckis want to sneak Popeye back in, especially as a villain, to show his displeasure with Kings Features' uncooperativeness?
Just a theory, and one that doesn't have to be accepted to enjoy this unique, masterful, and endlessly lovable film.