Very nice. Is it MDF or wood and where did you get it from?

What an exciting project - providing you have adequate ceiling height and the budget to pay for the services for a bespoke solution. You may want to consider using one of the better shop fitters who can design, build and project manage the whole job. They are used to doing quirky, small scale projects to a high level of detail. The better ones don't come cheap as you are paying for a multi-disciplinary service that is project managed and co-ordinated.

Oh wow you have been busy! It's funny, I was at my Mum's today and we were discussing your plans. We decided the bunk room was a bit small and she suggested moving it back like you have done. Agree the fireplace will be be better on the western wall, with flow from the kitchen to the backyard with large doors. I'm torn about whether the changes to make the mudroom bigger are changing too much what I loved about the previous iteration, i.e. the void and the toilet placement. Although my hubbie wasn't sure about the toilet where it was previously as he was worried sound would carry into the lounge I never thought of that to be honest and really liked how it entered from under the stairs ‍♀️ No views to the south so no need for the window seat, would prefer the void I think and no need for bath downstairs. Which version do you think works better? Perhaps the mudroom was big enough? I did like the extra room off it for storage etc Thanks so much for the renders, I'm a bit concerned that it now doesn't look like my original picture. I'm really trying to keep the look as American as possible with the pitch of the veranda and the pitch of the roof. This style has been my dream and is really so much a part of my vision. I don't want something that looks similar to other houses. Sorry if this seems silly. My builder did mention about the gas bottles and how they need to see their truck. Good idea between the carports. I wonder if it's cost prohibitive to have them buried at the front? Can I ask what the total sqm is for both upstairs and down?

I would definitely get them full size single beds, whichever solution you go for. You could get them each their own loft bed with heaps of storage and a desk or pullout desk underneath each. There are lots of different variants of these and some would even help to make them each feel like they have their own room or at least space. If you would like bunk beds that can still be their own single beds later, you should look into 'Bunkers' as this is their trademark. They are Australian made and all pine as well so no nasty chemicals. Pretty sure they also have the loft bed options and desks that you could put underneath. They do bunks that can go at right angles to each other with storage underneath in the corner as well so you could put the beds in the corner opposite the wardrobe and desk near the wardrobe instead of under the window if you prefer this to their own loft and desk/storage underneath:-)