Do you have a floor plan? Rough and hand drawn is fine. As long as you write the measurements clearly.

How long is room? If 2850 wide?

Yes 2850 wide by just under 1700 deep. It is an atrium that we are converting to an ensuite

Entry from bed 3

I would look at putting entrance with a hinged door near bedroom entrance. This then gives a full wall near the bed, instead of bed in front of ensuite entrance. 900mm width shower full length of 1700mm with a nib wall. Toilet 800mm , then remainder vanity.

Is it a strata unit? Are you able to use the full space for the ensuite? Or does the strata and council require a setback from the exterior wall?

I can use the full space

Alternative with bigger vanity. You could have 2 sinks but I have a preference for more bench space and honestly only one sink to clean.