Hello Dee, I would 'mirror image' your plan and have the kitchen against the original part of the house (to the left of your step down) and still with the island. You could then have sliding doors facing both decks, and hopefully a beautiful outlook to your garden, also a lovely vista when you walk down the steps... your living dining furniture will have the feel of more room against windows, rather than boxed in by walls.

Yes, I was planning on a free standing stove on the opposite wall and no top cabinets on the stove wall. Should I use mirror as splash back ? And black cabinets for the pantry wall and white on the others, White a white stone for bench top ?

I have floor boards in bathrooms. Second house that I've had this with no problems at all n first house and one minor DIY fixed water mark near skirting in second (due to kids). I would always aim for wood throughout but I think there are regulations that make this difficult in new builds.

the wooden floor makes it so much easier to consider moving plumbing and i'm wondering if moving the kitchen next to the laundry has been considered to enhance the indoor outdoor feel with a servery window and use the old kitchen meals area as a sitting tv area (with or without a means of closing off the area) and square up rumpus room and include the old entry to enlarge rumpus and create a new entry more centred along the verandah, having the new walls around the rumpus would allow for sound insulation and the two sets of doors between theh rumpus and living areas should improve separation without losing the separate study (guest room) and access to the other bedrooms and bath...accurate measurements would allow better consideration of this idea