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.
The loo, bath, sink and shower should be placed to give you as much room as possible. If you don’t have room for a separate shower cubicle and over-the-bath shower gives you the best of both worlds in terms of washes preferences.
For a simple look - Large white tiles - Kerry Phelan Design. Similar layout of our small bathroom with a floating sink! Would prefer a glossier finish to the tiles since we won't be tiling all the walls "wet room.