Hall wall on the left, bedroom wall at the top with the pocket door into the bedroom, party wall shared with the neighbouring unit on the right. Depth 96¼″ and length 124¾″ are your measurements. Two options differ only in the vanity wall.
Dimensions in inches. Grey hatching is wall; light tile is the dry zone, blue tile is the curbless wet zone. Dashed arcs are door swings; thin blue lines on the knee walls are fixed glass. Grab bars are the short dark bars along the walls, with dashed blocking behind them.
Hall door28″ slab, 30″ × 82½″ rough opening, hinged on the bedroom side, 15″ from the bedroom wall.
Pocket door to bedroom28″ slab, opening 20″ to 48″ from the hall wall, sliding toward the exterior wall into a pocket that ends at 76″. Stud bay 20″–76″ must be clear of wiring and plumbing.
Storage closet28″ wide × 28¾″ deep, single door hinged on the shower side so it swings away from the hall door. Its shower-facing side and back are framed, waterproofed, tiled walls; the back wall doubles as the toilet pony wall.
Partition36″ walk-in opening directly beside the closet wall (32″–68″), then a 4″ knee wall with fixed glass running 28¼″ to the exterior wall, fully covering the vanity end.
Toilet pocket32″ wide behind the closet's back wall; toilet centred 16″ off the end wall, tank on the hall wall, 68″ clear in front.
Open showerAbout 64″ × 60″. Shower head on the end wall, 18″ in from the party-wall corner, aimed diagonally at the seat; drain in the corner beside it, floor sloped to it.
Fold-down teak seatOn the exterior wall, 20″ wide × 15″ deep, seat top 18″ off the floor, starting 22″ below the knee wall so the bars clear the toilet clearance zone.
Grab barsTwo 18″ vertical bars on the party wall flanking the seat, starting about 33″ off the floor. A 24″ horizontal bar on the shower side of the knee wall at 34″ for the step between zones. A 30″ horizontal bar on the hall wall beside the toilet at 34″. Solid blocking behind each, installed before the cement board.
Waterproofing runs up every wet-zone wall including the closet's side and back; the dry-zone side of the closet is a normal framed wall so the cabinet box sits in a dry space. Toilet clearances meet the usual 15″-to-centreline and 21″-in-front minimums.