What a great idea for a book -- and an EXCELLENT writer.
Disney chorreography is seriously under-rated -- not by Chchoreographers (Mark Morris says upon any occasion that the best choreography for hte Nutcracker EVER was in hte Disney "Fantasia.") But dance-goers, dance-lovers tend not to give Disney proper respect. ALL Disney cartoons are balletic -- my current favorit is TOy Story 2; the scene in the airport, with the conveyor belts, is like Symphony in 3 movements.
Disney is about to come with a book on Disney's dance-related animations by Mindy Aloff. (I believe the book, now in production, is due out in early '09.) There, as I understand it, we'll learn much about the dance sources used by Disney artists. Hyacinth Hippo had more than one model,as I understand it, as, I suppose, did other characters featured in FANTASIA and other animations.
if i learn anything more precise about pub. date, etc. i'll post it here.