Gorgeous brick pavers, I love that look for the floor! It has a rustic appearance yet you're right- sophisticated, even an elegance. I think this would suit the feeling I'm wanting for the room, the pine boards have a rustic appearance, this would go well with them. We have a 1m square oak table with cross back chairs for the dining section and a La Spezia 3 light pendant (Beacon), farmhouse sink, timber hood cover to give you an idea of the look we're going for. Thanks very much for your thoughts on this. I like the idea you're going with, but yes, we have the window and door in already. Door could be trimmed if necessary. It wasn't until the window was already made and the wall sheets and cladding was removed that we realised the original kitchen layout had the back door next to the window, and the door into the laundry section was a modification. I most likely would have put it back where it was originally or had double doors. It made no logical sense for the back door to be a thoroughfare through the laundry, eliminating valuable storage space. I may have just left the kitchen in the original layout and made an entry into the laundry from the kitchen side for a laundry/butler's pantry with fridge in there. Removed the side window for more wall space for storage and changed the existing door to a window. But it's too late now, the outside of the house has all been newly clad so doors and windows are as is. There's no other possible place in the house for a laundry. It is a very tight space. Plan to build an external laundry studio in the future. The one in the house would be temporary, yet need it to accommodate a washer dryer combo for now, and be suitable for prospective buyers/renters in future if the external laundry doesn't eventuate. This is the original 1960's floor plan. A previous owner made internal access into the laundry and made bench space where the original back door was, the next owners opened up the living to dining room and blocked up the hallway doorway which became the fridge space. The cornice didn't match up in the hallway though where the old doorway was. They had made a shelf from the cut out on the hallway side, and the protruding section in the kitchen side became a kind of bulkhead for the fridge. Old hallway We've rebuilt this so that it could have an upper cabinet on the kitchen side/ hallway later if needed. But the lack of space in the hallway didn't allow us to build a linen cupboard, so that will also be needed to be included somewhere in the house. At this stage, thinking we will have to configure the laundry space to have a linen cupboard/ broom cupboard between the dining room and laundry section. Open to ideas too for storage in that limited laundry area space. I'll add more measurements to the floor plan for reference.

You could consider custom joinery that actually looks freestanding - purposefully creating a gap from the edge of the fireplace surround to the wardrobe & on the wall side also. This would also mean that it really does not matter if the front of the cupboards do not align with the front of the fireplace. Adding a nicely detailed leg, and a feature handle (you can get some really unique Australian made ones these days) to give some visual interest to the otherwise minimal finishes. Keep it simple & classic so it ages with your child's taste and preferences. As an example, The Design Files recent article has an image of a cupboard in a lounge area, that could be adapted to two double door units on either side of the fireplace https://thedesignfiles.net/2019/10/interiors-house-p-cjh-studio/. Seems perfect for a child of any age, or even if you want to convert the room to a more 'grown up purpose' once they leave home ;-)

This wasn't your question, but looking at a possible boxed out window in the open plan kitchen dining living it shows just how limited you space is. The following 3D overview shows a boxed out window seat. I have run the kitchen along the same wall as the new window, The Island is 2m x 900 with 1m between the wall base cabinets and the island and 1m between the Island and the wall where your plan shows cabinets. If you have/had cabinets along the other wall as shown on your floor plan they will be 600 deep this would make the island 1400 x 900 which is small. Has your kitchen been renovated and were you considering that, if not. Looking at the overall size of your open plan area I would be considering 1 or 2 large stacker doors to open up to the rear alfresco, that's what I would do but you need to choose what will work for you PS I think that the boxed out window at the front of the house is a lovely idea but possibly not right when it faces West.

Thanks for your comments guys! @siriuskey that's what I am thinking. But just not sure how would it look if I have the front door 2040 high with the highlight window above so hopefully in total as per the picture it would give the look of 2340 height and then will keep all the other doors 2340 high  Just not sure if that would look good or not @dreamer i actually really like the door in the picture without any glass panel. But at the same time I also want some light coming through our north facing entrance that's why thought of the highlight window above It would be really good if I can get a side light with this 1200 wide door then I am happy to keep all the doors 2340 high