Aluminium windows have come a long way. Their thermal properties are excellent and the range of colours is extensive (some companies more than others, so look around). Door hardware varies too, if this is a consideration. Timber would require more upkeep. I had timber in my previous three homes, and now have aluminium and they are the far superior product. Shop around and pay particular attention to thermal benefits as you compare. Best wishes.

my suggestions include changes to the roof to eliminate extra valleys and allow the "bump outs" to be under the eaves...Open gables over the porches and alfresco with raked 2400mm ceilings will allow the outdoor spaces to have a much more open feeling without increasing height and the simpler roof should be more economical ..the other suggested change is an increase in the size of the garage to allow for a smoother connection between the two homes as well as extra space for the vanity and wiw... btw bedroom, study, wardrobe and storage sizes are shown separately and the rear alfresco should be added to suit the outlook but a walled courtyard behind the laundry could make a good drying area and handi vege garden and create privacy between the two backyards for your lovely new home,,,btw you should remove identification off your plan

The Stratos switches are a Clipsal brand. Go to their main website or contact a local supplier.

Weeds often re-establish quicker than grass, so if your attempts to kill the weeds are affecting the grass it becomes a vicious cycle. I remember digging those out when we used to have a lawn before the drought but with the grass growing well there never seemed to be a lot.