For those still reading this thread. We just recently completed a bathroom reno in almost identical sized space though turned the other way. A lot of reflection in the photos sorry but there is a lot of glass and mirror. A cavity slider, while an added big expense, made the whole thing possible. To create the space I used the adjoining separate toilet room for the 1200 x 900 shower and shallow tall cabinet on the left and gained a closet in the hall outside with the rest of that corner. I also recessed the towel rail which helped give room to the shower entrance and not stick out in front of the loo. Wall hung vanity and toilet. Porcelain wood planks on floor with underfloor heating and also used in shower base. Excuse the towels, they are not my normal ones ! It was a big decision about joining the rooms and whether to keep the bath / shower but I think it paid off. There is just the two of us and it's a real pleasure to use and no longer feels like "standing room only"

correct measurements are the only answer...for your new floorplan you need a room (without any restrictions that would measure at least 2400mm x 2000...it's always possible to squeeze in some minor variations but only if it's worth the cost in convenience, improved value of the property and actual cash outlay.... the front door entry foyer would be lost, the new bathroom doorway wastes more space, the linen cupboards would be too narrow for anything except a few towels and sheets (that can easily be stored in a suitable vanity or bedroom cupboard) the bathtub is gone and you would have spent about $20,000 for a bathroom that is not better than what's already there?? ...the computer programs that we use are called 3D Home Architect and my version 4 is no longer available to buy but i believe siriuskey may have purchased her version recently? these programs do make the plans much easier to see but you must start with accurate measurements and an understanding of spaces needed ...start with a space about 800 x 800 mm for a toilet, 900 x 900mm for a basic shower, 500 x 900 for a single handbasin 1500 x 500 for a double handbasin then add in at least 900 x 900 for a doorway (including space for the frame and space to walk through...same for cavity sliders!) and then you'll need space to walk around in front of the toilet and shower and handbasins ......unfortunately with the plumbing and space restrictions i don't believe it's possible to do more than widen the existing shower space by rearranging the entry wall.(NB you'll still need to spend $5000 to $10,000 for demolition, carpentry, new waterproofing, tiles, shower, vanities wall cabinet, taps, plumbing etc..forget the linen cabinet and store linen in a new vanity and toiletries in a wall hung mirror doored cabinet and keep some width in the entry foyer (minimu 1200 wide) ...removing some of the non structural wall in the kitchen should be the cheapest improvement for the kitchen and add space for a small breakfast bar but removing the end counter would lose valuable counter space that could also be used for a pantry ...before making any decision you need to think about the reason for the changes...are the bathroom, laundry and kitchen in need of immediate repair, is the unit for your own use of needing improvements for rental or resale...?? always happy to draw up your plans but have to nag again about the accurate measurements...try measuring each separate room (ie shower, toilet and vanity, laundry and storage from wall to opposite wall in several places in both directions, ignoring all the fittings but include separate measurement of the diameter of the hot water heater.

It's a little unconventional badobbs, but have you considered a toilet with in-built basin and tap - these are very sustainable (although not for everyone!) and are perfect for tight spaces. https://specify.caroma.com.au/products/toilet-suites/profile/profile-5-toilet-suite-deluxe-with-integrated-hand-basin.  To answer your question, usually you need min 800-900mm or so for a fixed panel for a shower, however normally walk-in open showers are located perpendicular to a room, so that splashes and wet floors are contained to one end. Think of when you drop the shower head and it sprays water everywhere! In your case I would advise selecting a well made frameless hinged door - so you can still have a walk-in effect but a bit more protection from water spraying out everywhere. Try Reece; https://www.reece.com.au/assets/brands/244000/custom-glass-brochure-v1.pdf The vanity depth is going to be the issue here, usually we advise min 800-850mm clearance (although can go down to 700 as per Dr Retro House Calls) and can see from the plan that with an 800 bath and 700 clearance you only have 250 depth for your vanity when it's near the bath. You could get a vanity made up at 250mm deep with a semi-inset deeper basin centrally - that way you can make the vanity a little longer but with a workable basin. https://specify.caroma.com.au/products/basins/luna/contemporary-luna-semi-recessed-basin-without-tap-landing Good Luck!

I am going to be the odd man out...I greatly admire dark painted vanities: charcoal, navy, dark grey, even a mid grey, but I certainly understand restored timber would also be beautiful. If you were to do this, I would also paint the mirror frame in same colour. I am not sure you will achieve a particularly good result by painting the decorative tiles. For one thing it would be almost impossible to match the colour to existing tiles perfectly. I did this recently in an old kitchen (using linen colour chalk paint) and the outline of decoration still shows, and I painted the entire backsplash. In saying that, it was a good temporary fix for our purposes. The painter who painted the interior of this same older house recommended I paint the rather ugly old kitchen floor tiles, and he named a paint but I can't recall it just now. I like your idea about painting your floor light grey. I viewed the drivenbydecor link provided above in another post and was impressed with the results. It's worth a shot. Would also contrast beautifully with a dark painted vanity, hint hint.