I went with Rockwell in the part because of the crazy he can bring to his voice. I am casting more the novel's version than I am the films, and more in line with Anakin's Dad, a role mostly filled with bandages and the occasional CGI Hollow man.
Yeah, if Larry Drake was alive, I would have cast him as the Monster. I would have had an old as hell cast, but...I would make it a comedy adventure like those EDITED! [Old Guys go to Vegas] movies. Edited: Damn discussion rules for uncast actors! :D