We had several additional variations;
PCV005 - Elderton can include the electrical upgrades in the total house package.  However, we had opted not to as we had already paid the deposit to Costa.
PCV006 - This was just a detailed variation of the front/rear setbacks and the reduction of the Meals area.  I reckon this was needed as part of the Stockland Design approval. No additional cost here.  
PCV007 - Site costs variations.  After the site survey, the report came back and gave us additional credit of $1,428.  Total site cost came back as $441 only.
PCV008 - CANCELLED due replaced by PCV009.  
PCV009 - CDC requirement. Provided two options for the required privacy screen to the RHS of the balcony. (1)   Aluminium $476.  (2) Timber $972.  Obviously, we went for the cheaper option. lol
PCV010 - Option for a treated timber frame.  The price tag on this one was a hefty $5,561.  Nah!! Thanks but no thanks!