I see what you mean, 2100x2100 is not huge, but its certainly workable, is this a reno and are you working within an existing structure and if so existing plumbing as well?... I still think you can have a better layout to make better use of the space, looks like you're trying to cram everything in one corner of the room with an entire wall (to the left) dedicated to towel rails?... I see you've noted bedroom and hallway at the bottom, does that mean the bedroom is only linked to part of the ensuite and if so how much of the ensuite actually connects? presumably where you'll have the cavity sliding door... my suggestion to find a way to enclose the shower a little is not only to limit water splash but also to create some privacy from the toilet in the event that both are being used at the same time, could be a bit awkward? I was thinking maybe a nib wall with glass panel on top... I would actually also consider doing a nib wall where the vanity is and have the floating vanity from the left wall to the nib wall as that little gap you've got at the moment between the vanity and the shower screen would be difficult/annoying to clean... incidentally, the 540 depth of the wall hung toilet, does that include the cistern or will that be hidden behind the ensuite wall?

I'm not a great fan of added things that can break down, causing sourcing of remote repair people or parts.

Thanks for the comments. I don't mind making the cupboards higher but I am unsure what would look good. Should they be 1m, 1.2m? That will result in a smaller bulk head but the cupboards may look disproportionate compared to the base cupboards under the bench top. I have been looking for photos where the overhead cupboards are very tall but haven't found any.

I have high ceilings downstairs 2.7m and std door and window height and looks fine but do have wider front door 870mm don't like tall and skinny doors. Having said that on one wall do have higher windows and they look fantastic but that was to catch sun and block out ugly neighbour house so std window size just fitted higher but look so good in my downstairs open plan area could have gone larger height windows all around but don't have verandah across front house that would look odd with higher windows and no light benefit and more heat n cold thru glazing. Good luck with your decisions