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A little more adjustment and then I'm gone for the day, got a 9 hour drive ahead of me.
Although Foxy's fits within the height and width parameters, it fills in too much of the box. Take a look here. They only slightly go into the next size up (Monferno and Charmeleon barely even scraping it), but they also don't fill in nearly as much of the boxes total area.
Foxy's sprite looks great (there are some things about it I'd adjust), but because of how much space it takes up it looks huge.