if you decide to have a wall hung toilet or towel rails on the toilet wall the cavity slider wall will need to be reinforced to support the weight and a wall hung toiler with inwall cistern will mean that the cavity slider would have to slide towards the vanity..Either hinged or cavity slider doors will be good in this situation although the hinged door has the useful option for hooks for clothes or an extra towel rail...btw consider moving the master bedroom entry door for a more generous entry into the bedroom

am i correct in understanding that this space has no windows and will be a wiw and entry from the living areas to the master bedroom? do you plan to have enclosed storage (wardrobes with doors) or open shelves, what do you need to store eg clothes for how many people, lots of ball gowns and multiple shoes or mostly jeans and shirts, clothes for various seasons, or only tropical as well as christmas trees and suitcase and secret stuff...start with what you need to store and work backwards and excellent lighting (daylight, skylight or electrical) will make all the difference for success

I've had a think too (thanks to your thoughts @caitlinfurby). Would it work if the bath went down the end beneath the window (handbasin/end of bath currently there). The toilet stays where it is but the wall reduced to a pony wall. The linen cupboard on the right hand side as you enter the bathroom is removed, as is my sons bedroom wardrobe (a new wardrobe for his room can go on the wall in his room against the hallway). That new space is turned into a walk in shower. The cupboard on the left hand side can be widened a bit at that current entrance way to make a new linen cupboard. Around the corner from that, opposite the toilet could be where the handbasin goes or in between the bath and shower? The door can be a pocket/cavity door or just a barn style door to enter the bathroom off the hallway. The current door to the kitchen is actually hinged the other than the plans show but we could just re hinge it the same as the plans show. The first little box area on the plans to the right as you enter the kitchen will have to stay as that is where the fridge is. The window at the end of the bathroom is close to going all the length of the wall...don't really want window sill getting wet from shower hence why maybe bath could go there. Husband wants to have a separate bath and shower. Do you think these ideas could work? Means the plumbing can pretty much stay as where it is too. What to you think??

I don’t think that you achieving your goals of a smart use of spaces. If designing for wheelchair access, the bathrooms are not big enough. There is a very good standard on space requirement for wheelchairs. it is gold level of https://dfat.gov.au/about-us/publications/Documents/accessibility-design-guide.pdf Are you working with an architect? Wheelchair access is tricking as one has to think in navigating in a full circle spin. Doorways need to be 900-1000. Bathrooms need to be wet rooms rather than the conventional. There are some great architects in the Wide Bay Area, who will design function over form and at a manageable cost. It may be worthwhile investigating.