A three way bathroom can cost twice as much to tile than one large bathroom, ( sometimes more, depending on your tiles, there is a lot of cutting, it is in fact 3 rooms , each with its own tile bed, if you are doing it yourself, have a tiler give you a quote before , if you are having a professional business renovate in Sydney about $ 30K for all labour only. for a 3 way , this should be about $ 22/ $ 24 K for one large room, with nib wall vanity to toilet, niches to shower and bath, anything cheaper we would have doubt about quality of waterproofing, tiling, sound insulation To make a decision, go and sit on the edge of your bath by yourself and visualize your finished bathroom. one large ( less expensive room, ) or three small rooms. ON paper ideas can be appealing. Buying at the place where trade buys can keep cost lower. e.g Kaldewei Eurowa made in Germany steel bath 2.5 mm thick $ 400 You state it is your master bathroom,to us your master bathroom should have the look, if you go to sell your home this could make/ break the sale. Back to your vanity, the larger vanity will make the room look cluttered. Ken Evers

Is your final photo of the vanity you already have? I also thought adding legs would take it back to the MCM you are after. Would be interesting to know how the silver drawer pull is attached. Not sure about painting it matte black as I thought timber furnishings were more prevalent then, but it's totally your choice. I hope you will post updates as you go. I just love mid-century.

I'd suggest replacing your swing door with a sliding door recessed into the wall sliding to right. We did that with our tiny bathroom and it opens up all the wall and space restricted by the door for a vanity next to loo with niche recessed mirror fronted storage above the vanity. Go wall hung to keep floor clear for sense of space.

I would attach it to the vanity, it is awkward to try and reach behind you if you attach it to the wall or you could try a freestanding one that you could put anywhere though they might take up a bit of room when space is a bit tight