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.
Wetrooms—a luxurious and clever idea for a small bathroom. I lock the whole bathroom while taking a shower, so why not use the whole bathroom? Why spend so much time and money trying to make shower enclosures look good? (They're hideous.) Do away with them and have clean, beautifully-tiled, waterproof zen space in your bath for the same budget as sprucing up a shower and bathroom.