I currently live in a double storey but prefer single storey. Pain in the butt vacuuming stairs, moving furniture and carrying toddlers up and down. I love living here and will stay as long as my legs allow me to.

Just love that rabbit perhaps his hutch would be good to the left on the top terrace The sandstone rock and stairs to the left of your house could be worked on to look really special again, a Zen like The fern that was moved off the rocks is likened to a weed and best removed, I quite like the rock as a feature. As for any pavers any of the square or rectangle concrete ones would look great and are cheaper than most, please don't paint them you can get them from Bunnings. We also play Bocci on our grass that over looks water. great fun.

Ah yes, the perennial issue/question: how best to distribute/utilise budget over various project scope and in what format .....$150K it's arguably tight for this depending upon how you are intending on going about it - you'd have to be super super disciplined and there's no margin for any blow-outs/or pop-issues... reconfiguring wet areas & kitchen will stack costs up very quickly....even just doing the cosmetic/fit-out upgrades you've mentioned without changing any layout could nudge 100K.....what you need to do is prioritise your goals and then be prepared to start cutting out scope if you have a $150K limit...I'm with oklouise on this one....quite likely there's an alternative option that will arguably utilise your budget/investment better to add both more value and increased/desired living space to the home/set-up......I've seen time and time again people try and rearrange/shuffle layouts around with existing building envelopes and prove false economy with this strategy when considering what it ended up costing them...one way or another the number/cost will end up being what it will be and you'd be surprised what this could end up costing you in this format (think potentially high 200's ........more often than not I can demonstrate that a clean/clever building extension + minimal tweaks to existing will be a far better bang-for-buck option than the completely rip apart and put back together within existing footprint.....but to stack this up properly construction costs need ascertaining over various levels of trade breakdown.......

Assuming all your windows are similar in height to the one in the picture ( taller than they are wide ) I'd personally do just 2 panels . If you really wanted , you could even ask for a solid 'narrow beam' down the middle so they look almost like 4 sections . If you hinge them twice , and have 4 sections across each window , it will be quite fiddly , and maybe this makes me lazy , but why purposely make something that needs 3 or 4 fastenings at the top , another 3 or 4 at the base , and special holders to hold them firm when they are opened . Wide plantation blinds , with a catch each side , is all it needs .