We building a different house but some of the changes might work for you. Extended robes in bedrooms. Change the internal garage door to exit either closer to corner or directly into laundry. Wall space is everything. Glass slider at the rear to exit into backyard(depending on block etc) extend fridge provision (the standard was to small)
We had a few changes too from their basic measurements
°Extended all wardrobes from 1200mms to 1900mm
°Extended two windows to the dinning area from 600mm to 900mms each for more natural light to come through
° Extended the sliding door from 2000mm to 2700mm leading to the backyard for more natural lights again
°Extended the fridge cavity to 960mm
°Removed the linen cupboard in the hallway to make the walk in pantry bigger
°Added more shelving to the bathroom cabinets
° Removed the three timber posts in the terraza and replaced with a brick post
°air con and stone benchtop
We're building a Lexia as we've got a rather slim block of 13 by 32