In the smaller set, the dwarf figures measure approximately 2.5" tall and Snow White 3.5".
Dan Alexander of the Dizmentia site has provided us with some close-up shots of the Dopey figure. The piece came from his grandmother's collection which she'd acquired during the movie's initial release in the late 1930s.
And here's a nice shot of the entire set from Major Pepperidge of Gorillas Don't Blog.
The dimensions of the smaller box are 5" x 9" x 1.5".
The larger set has a box size of 9.5'' x 17'' x 2.5''. The dwarfs stand approximately 4.875" tall and Snow is 6".