Lay them both landscape.

Have been double waterproofing for many years and NEVER had a bathroom leak Have renovated many 100 yr old bathrooms 1..... Remove floorboards, check dimensions ,spacing and condition of bearers and joists and if level...More often than not 100 yr old homes do not meet 2020 Standards And all supporting timbers require replacement ( Not a big job, worth the effort ) 2....Plumber should check drainage, moving items easy and cheaper at this stage 2 ....Lower if necessary to level timbers and Scyon to finish 40 mm lower than outside floor, fix to manufacturers spec 3... Plumber to fit item pipes and drainage penetrations ( Puddle Flange ) consider location of floor waste ...may be preferable under vanity drainage for shower and floor waste.. 4....Waterproof entire floor, up walls 300mm shower etc to standards Prime and we use Davco K10 plus, 5... Add water bars to shower and doorway, Sikaflex , adhesive/sealant ( NEVER Silicane ) ALL Walls to floor.' Shower corners to 2000 mm Waterproof second coat 6...Tiler to lay tile bed and establish fall to floor and shower 7.. After drying, Polyester bandage shower walls to floor, Waterproof Third Coat 8... Final Coat of waterproofing 9...Tiler to tile Ii takes around 7 days to waterproof as for $ 50,000 bathrooms Any further questions, Pleas feel free,If in Sydney Contact

This with the extra width you suggested the built in bath with a large shower space next to, the shower head coming off the opposite wall to help avoid water to window, the window would be best tiled, the wall with the shower door into "The wet room could be all glass up to the vanity. There are several suitable places for towel hanging and an extra storage cabinet could be above the toilet, I forgot to add this

but have you checked with the local council and other owners to find out about any restriction to your proposal ...you need to allow at least 80cm x 80cm for space for a toilet (including knee and elbow room) 820 wide and no smaller than 750wide for a doorway and pocket doors need the whole wall ie more than twice the width and taller than a door to be removed form the brick wall to allow for a new framed wall to enclose a pocket door, you may be able to find a tiny shower or have one custom made as a"wet room" but that means lowering the whole floor to allow for drainage and your plans don't allow any room for walking and standing to dress and attempting to keep the small entry hall uses too much space needed for the bathrooms ... i'd be surprised if a plumber would agree to do the work ..i think a variation of my original ideas is the best option but you need to check with the other owners, council and a plumber to find out what;s really possible as there are many practical and legal reasons that need to be considered