Tiles is another big one for us to wrap our heads around, so much variety to choose from (well outside the standard range!)
If it's any help we just did exactly that for the down lights on our Chifley 42, put all single power points anywhere we wanted them as will likely change the type of powerpoint after handover to a different range and doubles and some with USB so no use paying the pricey Rawson price for something that is just going to be replaced later. Our electrical still came out at about $12k even with the free 20 downlights in the current promo, all the rest of the downlights downstairs just pre-wired and only the 1st light from a switch upstairs pre-wired so we'll still need to get any of the pre-wire light installed as well as wiring and light install for the extra 3 lights in each room upstairs after the 1st pre-wire to switch.
Got them to do double external power points as there was only $10 between a single and a double and don't plan on changing them but just did pre-wire to junction boxes for any external lights & for a ceiling fan in the alfresco.
One thing that caught us out was the extra power and light circuits they said they would now need over the tiny number they give you standard. I think we needed an extra 7 or so circuits at $330 each!?
Our tiling cost also came back at about $26k which is for an upgraded wood look tile downstairs, porch & alfresco (to be done after handover), full height tiling in all bathrooms, and some slightly upgraded tiles in the master ensuite & shower niches.