Pinned for the idea. Not sure how much I like the extension over the toilet. If were to do, vanity top should be one piece, with no cut line. Also: Consider how much the extra counter space would be needed.
Fantastic bathroom features a gray washstand painted Farrow & Ball Elephant's Breath accented with nickel cup pulls topped with a rectangular vessel sink tucked under a vintage style wall-mount faucet lining a white beveled subway tile backsplash.