Save the pink bathroom! The original floor and the pink bath are beautiful! And obviously appropriate to the era of your house. http://savethepinkbathrooms.com/ To give you a more spacious feel, have the door replaced with a cavity sliding door - it gives you an amazing amount of extra space, we did it in our bathroom I would replace the vanity, which is obviously not original, with a custom laminate vanity with cupboards underneath in pink (top) and grey (cupboard doors/sides) or even a boomerang pattern for the top (http://retrospaces.com.au/retro/images/laminates/Renovation/FirstLadyPink.jpg) have a skilled tiler repair any areas that need repairing and have the tiles professionally cleaned and re-grouted and re-do all of the silicone, Then replace all the tapwear with new chrome taps but in an appropriate style (like these for example http://www.caroma.com.au/bathrooms/taps/retro/retro-wall-top-assemblies) and a new glass shower screen. A really fresh coat of white paint (use the bathroom product), better lighting - put a light in above the mirror (http://www.ikea.com/au/en/catalog/products/00255303/) and a fan/heater/light in front of the vanity exactly above where you'll stand when you get out of the shower. If the mirror isn't in good shape (or it may be mirror doors on a cabinet? I can't tell) then think about replacing the mirror too. You'll save a heap of money over completely re-doing the bathroom and importantly you'll be in keeping with (and preserving) the midcentury design of your home.

@dB Emery, I am also about to embark on a bathroom reno myself and my plan is similar in some ways to yours as the room has a similar layout. I, too, have the bathroom door in the middle of the wall which I don't like but its not easy to move. My plan is to have the vanity on one side of the door (same as yours) but I am planning to have the shower on the other side of the door. The bathtub will go under the window so when you open the door, you will see the vanity to your right and the freestanding bath right in front but slightly towards the wall that holds the vanity. The toilet will go on the other end where your plan has the bathtub. My thinking was to have a visually open space when you enter the bathroom and the showerscreen, even though it is glass, might visually make the bathroom smaller. I will try to find my plan and post it here. I do have a question about the showescreen. Have you consulted anyone on whether a 1200mm long single pane of glass will prevent water spray outside the shower area?

@Kate We were thinking that having the shower rose on wall B might help reduce the splash out. @bigreader The opening is 400mm, but we were thinking 500-600mm would be a better option. A shorter panel might increase splash zone? @dreamer We were aiming for a 600mm entrance. Extending the vanity across could be an option (the current layout is showing a 600mm vanity) - this might give us more space for the toilet (we are not bigger than average) or a larger vanity. @K s Could certainly be an option - we just thought with this, it would save the first thing you saw when opening the door from being the toilet. We were thinking to attach toilet roll to wall behind toilet or on the vanity itself.

Forget that comment. I see siriuskey has already changed it to avoid that happening. In my bathroom reno at previous house, I had the mirrored storage cabinets above the vanity and toilet and they were so useful. Highgrove bathrooms has some lovely ones IMO. Make sure you buy an off the rack one and then get the wall frame/studs designed to hold it. It works out so much more expensive, getting a customer made mirrored cabinet to fit into a wall cavity. Because the mirrored overhead cabinets were put in the wall cavity, there was no issue with banging your head when you leant over to brush teeth, wash face etc. If the mirrored cabinets went across the whole section of toilet and vanity, you would hold a lot of things in it and it wouldn't matter how small the vanity was because you will be able to store so much in the overhead cabinets. Just be sure that it is deep enough to hold toilet rolls etc. I also got a wall socket fitted into the cabinet so that I could charge things like toothbrush etc whilst they were in the cupboard. It gets more complicated when you are trying to fit powerboards into drawers (well it was for me, so I didnt end up doing it).