According to Toto, the inside basin measurement would be 6 1/2" from the top to the bottom.
Yes the cotton white is a bright white.
http://assets.nationalbuildersupply.com/ul_pdfs/SS-00290,%20LT542G,%20V.02%20(1).pdf">here is the spec sheet for this product. While it does not show the cutout size, the bowl is 19"x12-3/8".
This sink does have SanaGloss. Many of TOTO's products have SanaGloss, but not every one does.