I would, if you go for square basins, I'd be going for a rectangular bath - or round/round. All the best.

Your renovations are well underway, so after seeing the small floor plan and that the vanity is on an internal wall and you apparently still want the Shaving Cabinet. Having cavity brick walls I would get your brickie to remove a section of the brick wall so that the shaving cabinet can be recessed back into the cavity, this will overcome any concerns you have about bumping your head, this opening can then be patched along with other walls. I would take all of your photos and measurements to someone like Reece to pick a hand basin to fit,, I would also keep in mind that if say the width of the vanity is around 900 the shaving cabinet would match that width and you would end up with say 2 x 450 mirrored doors, which puts the mirror join in the middle and in your face when using the vanity. cheers

without further input from HU-206141322, dimensions and wall materials we can't offer precise ideas. A basin fully or partially recessed into the wall is the best solution but depends on material used for the walls. The following suggests moving the door which could allow enough space for a small hand basin without recessing. But without more details hard to know

It probably depends on where you live. If there are lots of families then i think the 4 beds would be the preference, 3 brms are a lot more common so often 4 commands a premium. An ensuite is always desirable but i would probably just look at converting the linen into another toilet. And create built in storage in all the beds