The bricks are a nice idea but probably not suited to the slate. I would possibly add a pendant light or 2....maybe wire caged over your dining and a white bookshelf to the wall of the kitchen. Does it currently have a blackboard on it? Anyway I would add a white bookshelf and add stacks of bowls and cookbooks and some decorative personalised elements. This will add some depth and a refined industrial feel but not be too heavy in relation to your slate.

take this photo to second hand furniture/kitchen stores and contact P&O

The dining room is only 3.3 x 3, you do not have room for a table and lounge chairs plus a walkway to outside. Again, the family room is only 3.1 metres wide. This is not enough room for a dining suite and a lounge to be a comfortable space, since again it is a thoroughfare to the terrace. Mark the size of your furniture on the floors with masking tape. Allowing for areas to pull out chairs and comfortably walk around the table, and to outside. The family room could have a long eight seater dining table up towards the kitchen, and then maybe, two single lounge chairs in the space with all the sliding doors.

Those seem to be trademark varieties from outside Australia. You could contact Daly’s fruit or Diggers Club to see what dwarf varieties there are available in your area.