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.
Discover small spaces design ideas on HOUSE - design, food and travel by House & Garden. Utilise that strange little space in your house by turning it in to a smart utility room. (houseandgarden.co.uk)