You need a sliding shower door. Lots on here https://www.google.com.au/search?q=Sliding+shower+screens+in+Australia&ie=UTF-8&oe=UTF-8&hl=en&client=safari

Thanks siriuskey, similar to another suggested layout which works well in the space. Will definitely put in a mirror shaving cabinet and replace the horrible 70's spec shower screen currently there. oklouise, thanks for another great suggestion. I'm open to moving everything at this stage (subject to plumbers costs). The entire property is only around 100sqm (double storey barn conversion) so there really isn't another space for the "laundry" to go. Having said this, we did contemplate a European laundry in the kitchen, but again, we'd still have spacing issues plus additional costs that we don't have the budget for. I definitely have lots to discuss with Mr Danielle!

The doorway that sarah has shown at the entry prior to stairs will be load bearing to support the stairs above where they change direction. But it could just be an entranceway. Okl opt 3 I would prob do a 1200 enclosed shower to get a decent sized towel rail outside shower, with door and short end and shower tap near door. Bath robe hooks on door. Not sure if enough the height for toilet under stair, sadly.

is this a plan for a new building or a renovation of an existing bathroom and are the doors and windows fixed, what is the depth of the vanity and distance from the corners to the doors and windows? but, based on assumed extra dimensions, my suggestions would be to rotate the bath and have a simple shower cubicle with hinged door as a walk in shower would be difficult to avoid a wet floor without more space but there's extra room for a longer vanity and more elbow room for the toilet that's tucked more out of the way next to the vanity