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.
sink/toilet combo For an absolutely tiny bathroom that is functional and luxurious, I would move the toilet/sink to the corner, along with the mirror, and add a rain shower on the right side, or as shown in the photo but with the rain shower in front.