This sounds great. Just so you know, the oar for Xerography (1961-1981) Disney films is variable. They were animated at 1.33:1 so that when they were seen on TV they wouldn't be pan and scan, but they were intended to be matted to a widescreen aspect ratio for their theatrical run. The compositions for these films reflect that, and look better at a widescreen aspect ratio. (When viewed open-matte, there tends to be a lot of empty space on the top and bottom of the image.) These films were often presented at 1.33:1 on DVD because most people had 4:3 TVs and an irrational fear of black bars.

You might consider actually cropping (matting) the iTunes version to 1.75:1 to replicate the theatrical viewing experience. (But an open matte version would save you from re-encoding the iTunes version, so it's your call.)