Hi Jasmine almost impossible to give you accurate guidance without room measurements. However a layout similar to below could work with the right size furniture & the TV mounted either over the fireplace or close by. If you got 2 backless bar stools at the kitchen bench this would give you added seating as people can turn around & face the lounge area & be a part of the conversation. This layout also keeps the walk way free to the deck area. A rug would anchor the area. However again I can only say that without room measurements it is difficult to give you the best advice.

Understand what you are saying, it is a built in fire model and not a free standing, so to build it in you would either have to box it in internallyor external brick work would need to to worked with. The easier choice,I think would be to box it in internally similar to the photo tyrian posted, or just to the height of the fire box with the flu exposed. Do you have a model number that can be googled for installation details or contact Lopi supplier for this to ensure safety.

haha!!!! Siri - you can have your Eiffel tower angel... give me the beach any day :) Nic - perhaps some driftwood, shells and a jar of sand might help bring the beach to you - just don't knock your sand flying or you'll literally be able to crank up your fireplace and lie down on your sand to sunbake lol.

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 ;-)