If you are doing 2700 ceilings, you have to go the higher doors (2400 I think?) or it looks odd. Ducted vac is a must have. Plan for plenty of lights and GPO's, even outside (dont forget dimmers). If you are putting in splits for a/c, get the circuits put in for it when you build. Internal entry from the garage is good if you can make it work. External gas point for BBQ is a winner. Big Alfresco and deck out back - our deck is 50m2 and is perefct for entertaining Theatre rooms I highly recommend - atleast consider pre-wiring so you can make use of it later Double doors at the entry gives a home presence Painful but ultimately satisfying experience.