Hey guys!
I did the full audio upgrade finally. I went through Profound Sound in Melb to get it done. They stripped the whole car and put in the new stuff
Ordered the Fascia and headunit enclosure from Japanparts which came out to be $380 delivered
https://www.japanparts.com/parts/detail/40703https://www.japanparts.com/parts/detail/29758 - for 7inch screen
Headunit - Kenwood DNX8160DABS
Amp - Alpine PDX-V9
2x Alpine 5" typeR splits - for the 4 doors, tweeters in front and boot roof
Hertz 8'' slimline sub - fit into the factory enclosure
Functionality wise they kept steering wheel volume, track skip and mode buttons working. Couldn't get the steering wheel phone buttons to work which is apparently a common struggle.
The fascia also didn't come with any supports for the headunit so they had to custom make those and fit it.
All up though everything sounds amazing and the old headunit really annoyed me cos it was old, so well worth the swap.