Hi Bec. I have a Federation home with high ceilings and I just installed a built-in robe in my master bedroom. The door swing lands within the wall-to-wall run. My solution was to install a 2200mm high robe and run a decorative capping all the way round to top edge. Behind the door, I stepped the robe back and installed a wide stack of drawers and open shelves. It neatly fits in behind the swing of the door without needing expensive structural modifications. I don't recommend going all the way to the ceiling where you have the luxury of height. It will shorten the room and you'll never get up there. In my case, the capping provides a lip which helps to conceal things I store up there that I don't use often like suitcases and bedspreads.

Diane..you sound so much like me...even down to the .."it doesn't have a style yet"...I have a similar wardrobe and was thinking the exact same thing on the weekend? ie. what can I do to it to not have a dark timber wardrobe in my room...although mine got wet when i moved it and now some of the veneer is peeling off, so it really needs help....I had only considered wallpaper or painting (after veneer taken off altogether which may wreck it)....i will be interested in seeing what you do with it... Maybe the fact that you room doesn't have a style yet, means that you should do something to the wardrobe that lends itself to a classic style or is a fairly blank canvas, so that you can add the style later with art and bedspreads, bedside lamps etc....(I have no design sense at all, but just thought it may be a way to do something now and not have to decide on a particular style yet)

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 ;-)

I agree with Kate. This latest photo clearly shows that the top cupboards are too tall. The scotia or cornice will work on top sides of wardrobe, but at the moment, you can not put any joinery in front of the top cupboards because they will not open. You need, as mentioned before, to have the wardrobes reduced in height, for any installation to look good.